you should have wedge and dutch swap astromechs, squad leader on luke is very wasted since the only person who can benefit from it is dutch, i suggest you take that and his R5 astromech out and give him marksmanship instead. R5D8 is inferior to R2D2, I only consider R5D8 when i already have R2D2 in the team. something like:
-Ptorps, R2D2, expert handling
R5K6 given to Dutch because of the synergy between them, if R5K6's ability goes through, Dutch ability activates again. This frees up actions for both Wedge and Luke, who can then use it for other things like marksmanship etc. i switch marksmanship over to luke to make him a bit more combaty, and gave expert handling to Wedge. He can do things like green maneuver, repair 1 shield via R2D2, then barrel roll out of an enemy firing arc, then still plummet somebody with Dutch's free target lock. On the next turn, another green maneuver to get rid of stress and repair 1 shield, and you can barrel roll again, i think you can see where this is going. Luke with marksmanship is pretty good since now he has Dutch to give him the target locks, he doesn't really need focus either due to his ability.
if you need more staying power because you are a 3 ship build and find yourself taken out too quickly, toss the R2D2 over to Luke with this exact same build.