I'm thinking about running this list. My idea is a U-Boat type list. Any thoughs on improvements are welcome.

Jonus is a little overpriced for what he provides these days, but in this kind of list, I can see where he's invaluable. With Jonus being the higher PS, have you thought about possible swapping the GSVs to Protorps. My thought is drop threads, drop Homing on the Scimitar to Concussions, and up the torps on the other two. I'd suggest throwing LRS on the Scimitar a well. He'll be far more likely to get his munitions off that way. It also helps as spending the focus on the shot means you won't have it to spend on the attack, so this gives you a way to mitigate that somewhat. If you were willing to give up some alpha firepower, you could swap the Scimitar to a TIE Shuttle with Fleet Officer aboard.