For in-game effect, rather than calculations, you can never rule out advanced sensors as an upgrade. I think people playing against Corran are going to want to block him and generally mess up his actions, which is the downside of his high PS. I know I'd be putting all kinds of stuff in his way, especially if he was stressed and his moves were predictable. The moment he bangs into the ship he has his target lock on his efficiency drops away fast. Double shots missed hurt twice as bad.
I'd argue against PTL on Corran because stress is not at all your friend. Maybe it would be ok with an R2, but there are better mechs that you'd want instead. I expect that you'd often want to have Corran pull a long K-turn the turn after he did his double shot, so you don't want to already be stressed at that point. For sure you can pull 2 turns to get back if you've got the R2, and rolling helps, but that option to put an evade up with advanced sensors and then K-turn seems like it would be great to me.
So my set up would be to go with marksmanship and advanced sensors, plus other stuff if you want (engine definitely a good option). If I'm going to hit something but there are other targets behind it, I can just stick up marksmanship and then bang into the first ship. You could even use the e-wing's speed to do this deliberately, so that corran was touching the front shops, in range of the second line (I'm thinking of a swarm-type set up here) and took minimal return fire.
Instead of the advanced sensors you could try someone who hands out actions. Lando would be by far my preferred option here, but then you're running a 2-ship build. That could be interesting, I suppose! It might work, if you stuck R2-D2 on Corran and really worked to keep him alive... well sometimes it might.
Edited by Mandragola, 09 June 2014 - 06:04 PM.