I honestly don't know what to write here... none of these hands make sense to me. I would have been happy taking a decent chunk of their stack(s) rather than chopping each time... so some thoughts:

1st hand:

You're in mid-late position with the hand of hands.. I would raise... there's one caller in front of you already, and 3-4 people to act behind... I would (If I wanted to "slowplay") only raise maybe 2-3x the BB.

Flop: Not a good flop, there's an unlikely straight (unless you're Pinhead), and the BB could have anything. There's also the flush draw. I wouldn't just call here, I would bet and think "I'd rather win this mid-sized pot safely than lose a big one". The raise in front of 50 is insulting to say the least, the pot is about 225, I would raise to at least 200, maybe 150. Just to at least see where you're at.

Turn: two flush draws, 4 to a straight, and you have no information really... I think I'm beat here now if someone bets, but I call the 200 as well.

River: Miracle, but a chop, no excitement.

Hand 2:

If he's that weak tight, and doesn't hit anything, he's not going to pay you off.. bottom line. If youhad re-raised pre-flop after he made a significant raise, you'd have gotten more outta him I feel. Of course, he was also calling with A high on the flop and turn, and then again, the lovely chop. Once again, he bet 25% of his stack pre-flop? I think he would have gone all in there.

Hand 3:

Raised already, I'm not against the pre-flop call.

Flop:

Two straight draws and a flush draw out there, and you have top set... I would have bet, but a check raise is okay if you expect him to the SCB (Standard continuation bet), and let him know he's beat (again, win mid size pot rather than lose a big one).

Turn:

Scary now... fills out someones straight possibility, if I was going to bet here, I'm all in. The 1600 raise is not a lot for a pot of 5200, and if you have gone all in, (+1367), you're doing your best to make him make mistakes. He may still have called but if you were wiliing to put in 3600 chips, then 4900 isn't much different.

River:

You're at the mercy of the cards, and you know you're beat.... but the 1367 is only an M of 4, so you've little choice.. I call too and cry about my decisions earlier in the hand.

No offense meant in the post, I just think that we may play very different games...

Mark