From a couple of games I've found the U-wing's biggest weakness is turning round.
The fact you have to actively choose the landing mode the turn before, and it increase your (already fairly high) vulnerabilility to enemy fire, is very tricky to deal with. You're likely to want to prep a turn exactly when you're going head-to-head with enemy ships, which is also when you least want to lose a green dice.
Instead I've found it best to stick in Attack mode on your first pass, then do a 4-straight the next turn and flip to landing mode. That way you're most vulnerable when the enemy ship is weakest - even against defenders you should at least be at range 3. Then flip the turn after and get back to 2 agility.
I feel Advanced Sensors isn't a bad call on the U-wing, giving you an action on a stop/turn, although FCS is of course very effective. Advanced Sensors/Jyn is something I want to try out - I could see being able to choose when to trigger the action depending on whether there are more enemy ships in arc at the start or end of your move very useful.