While I do see it work on autocast, I actually didn't realize that the ship had to be "killed" by the ability and if another weapon did it, the capture wouldn't work. Since it sometimes sends the boarding party at ships with full health, it won't capture them every time.
So I've been focusing some fire on ships I want and trying to send the boarding party at the right time but they've just been blowing up. I may see if I can then have them focus on something else when I use the ability to ensure a reliable capture for testing purposes.
I do get that there should be some limitation, because the Rapture can reliably capture ships with it's level 6 ability. The Corsev shouldn't be able to do exactly the same thing right off the bat.
(I also wonder if it would be possible to make the ship look thicker and beefier like the other TEC ships. I think that would be sufficient.)