Ok, brace yourself. I'll attempt to review the global story in one go.
I was actually a bit hesitant to set a full story around Meredith and Lucinda, since they are somewhat villainous characters with vague moral compasses, and I wasn't sure how readers would respond.
First point, it's funny that you mentioned it, because personally that's the exact reason why I couldn't get into the story like in the previous ones. Meredith and Lucinda are great antagonists and well-written three-dimentional characters, but I'll be honest: when they are put into the role of protagonists, I don't care to see them win. And reading a story while actively rooting against the protagonists is not a pleasant experience, so that's not something I want to do. Same with the FBI ladies. They aren't characters I necessarily want to see come out on top, so I don't care to see them win. And as expected, I didn't care and didn't feel anything when Meredith and Lucinda or the FBI ladies got their 'kinda more-or-less happy ending', and certainly not joy or satisfaction, no matter how well-written their interactions were. And of course the story is aware of that potential problem, hence why Lucinda and Meredith ends up helping the prisoners (even if it is because it also suits their own ends), or why the story attempts to portray the pirates as even more cruel. (As far as I'm concerned, the key word being 'attempt'. Meredith and Lucinda have proven to be as sadistic and murderous as the pirates when they're in control, so the main difference is that they had less means. During the scene in which Lucinda is threatened, I didn't feel worried for them, I felt more like they were getting a taste of their own medicine.) But it doesn't change what I think of these characters. You could say it's the risk of having only morally grey characters. Though I admit I'm happy to be the vocal minority here, as the other readers enjoyed these characters.
Because of course, my personal considerations aside, the story has the usual quality of your other projects, so I'm not going to dwell on my negativity any longer.
Second point, I've briefly touched it upon in my first point, I'll mention it again, the interactions between the characters are as always one of the main strengths of your stories. Either to create funny interactions, or more serious and emotional ones. (For instance, I won't deny Meredith's and Lucinda's interactions feel true and greatly illustrate their love for each other, my personal feelings on the characters notwithstanding.)
Your characters have their way to respond tit for tat to each other. The back-and-forth between the FBI agents and the pirates when Doreen, Verna, and Lorelei are captured is one example among others. I can perfectly picture these dialogues in a fast-paced action comedy movie.
One other example among many:
Lucinda shrugged. "Actually, I've recently been promoted."
"Promoted?" The guard was nonplussed. "To what position?"
Lucinda grinned. "Yours."
I also always enjoy the idea of characters being self-aware to some extent about the fact they live in a USB-world or characters who lean on the fourth wall, so I of course appreciated Doreen's comments - and Kristen who rightfully points out her comic relief role.
'Uniform Swiping Babes'
I live for meta-jokes like this. Well, also for many other things, but your good lines are certainly one of them.
Third point, the tone of the narration is also very good at conveying comedic moments. I often mention the dialogues as a comedic strength, but I don't always think of mentioning the narration. You, as the omniscient narrator, have this slightly joking tone sometimes, and it works great. One instance to illustrate my point:
"After about twenty seconds of muffled beating, grunting, and seaworthy profanity, the closet room grew silent once again."
The "seaworthy profanity" part wasn't needed, but its mere presence turns a simple offscreen mugging into a funny line.
Fourth point, your pacing is as always an other strength, with the different storylines joining, and the suspense (and with the classic cliffhangers, of course). It's always interesting to see how the various characters end up helping (or hindering) each others.
The plot had a 'villains act, protagonists react' kind of structure, with a first part centered on the pirates' invasion of the ship, and a second part centered on the prisoners' escape alongside with the FBI trying to do something useful. As for the last part of the story (the part centered around the escape), you played on my soft heart. I'm always in for a scenario featuring the prisoners of a criminal organization breaking out while returning the favor to their jailers USB-style.
Fifth point, about the USB parts. Some more unusual outfits were stolen in this story, which is always a good thing. The scuba gear was already mentioned I think, but I'll mention it again. I also liked the idea of having henchwomen of an evil secret organization - well, technically they were pirates, but you catch my drift: the sort of minions you see in superhero or spy stories. Or like the delmo corp, for a more USB-related reference.

Plus, Dr. Domina is just begging to become a minor Marvel villainess... unless that's already the name of an obscure comicbook character. It wouldn't surprise me!
Over the story, you used various ways to subdue the women; including threat, sleeping gas, chloroform, martial arts, neckchops, and offscreen takeouts. And the classic conk on the head with a trail. Variety is always a plus. Same with the various unlucky damsels and their physical characteristics. As always, I like your way to give from time to time these 'damsels of the day' a few lines or a small scene to expand their personalities.
I also keep on discovering new colour shades when you describe underwear... After 4 years, it's a bit reassuring.
To conclude on a very serious life-changing question: Is it me, or did I spot a pattern? The FBI ladies' speciality seems to be to show up after someone else did all the job and reap the glory?
"That island... which doesn't appear to be on our maps."
"Hear me out laddie... Have you not heard the stories? Captain Barbossa and his crew of miscreants sail from the dreaded
Isla de Muerta. It's an island that cannot be found... except by those who already know where it is... YARRR!"
...
...
I apologize... Though in my defense, I want to say that the story was just begging for pirates-related jokes.
It was at that moment, though, that the forces of fate seemed to intervene.
Yes, the forces of fate. Also known as... THE PLOT! ... I also apologize.
To conclude for real, even though I clearly couldn't get invested in this story due to the characters, this instalment has the same quality as all the others when it comes to the writing.