Tycho's ability is meh. A-wings really don't have any problem clearing stress anyway, so it's usually better to just take a green squadron pilot with PTL. The 7 point premium that Tycho demands just isn't worth it.
The a-wing. I'd make Tycho's ability suck less - like his A-wing has 4 agility dice since he's the best at flying one.
WHAT????? Tycho is the best Push the Limit Pilot in the game. Basically you just write off the K-turn and since you have engine upgrades and lots of hard turns its not a problem. Then you just take two actions all day long. Other than not being able to K-turn there is nothing stopping him from have 200 stress tokens! Tychos ability is one of the best in the game.