Hand #1) I wouldn't have capped pre-flop, a call in that situation would have been sufficient. I don't think you needed to fold to just a bet either. Depending on my read, I might have raised him to see where I was at, but at a minimum I'm calling.
Hand #2) I know it's kind of tight, but I would have most-likely folded after MP1 raised post-flop. My limited experience has taught me that I lose much more cash chasing with big slick after I miss the flop than I make when I get lucky and suck out.
Hand #3). I would have had to pay the guy off inthis situation. It's probably a loser, but that's what I would do. Good luck.