1: I'd raise pre-flop, with the intention of betting even if I miss.

2: The two cards that you absolutely didn't want to see, the A and the K, came. I can't say if it's worth it to try to bluff here.

3: I don't mind calling him down here, I think it worked out alright as is. If you raise, you're losing money to a 9, and folding out hands that you beat. I could see villian having A-high here.

4: I don't know where I'd be able to fold here, but I'll just point out that the pre-flop raise you did here was good, and it's the same kind of raise that I'd suggest for hand 1. Not much you can do when your opponent flops a full-house.