Maybe we need a -2 astromech. Would help generic Ewings, Xwings, and T-70's. Wouldnt help out Poe as he needs his regen droid, same as Corran. Maybe put a stipulation like primary weapon of 3 or greater, so Ywings cant use it, or agility of 2 or greater.
Poe with -2 point astro and sensor cluster, IA and predator. 36 points. Lovely.
Yyyyeah...no way there is a negative-points astromech unless it does something an Ace would normally never, ever do or want to happen. Like, I dunno, make all hard turns red. Or reduce pilot skill by 5. Or cause you to take 2 stress tokens every time you'd normally take one. Or etc.