jeff,

In hand 1 check/fold to any reasonable river bet.
In hand 2 your play is fine. Dont lead flop. If your stats were over a bigger sample size I would also check/fold flop.
In hand 3 is tough, if I was HU I would mostly raise his weak flop bet, but I think a flop fold is OK with UTG yet to act. Even though you are getting great odds on every streets I have a hard time calling with this board.