Am I Playing These Wrong???

[Songwind]

*grunch*
Hand 1 seems fine to me.

Hand 2 - why didn't you raise this preflop? Raise KK before the flop until the button falls off. I also bet this river. With your aggression, I think that UTG+1 would have 3-bet you on the turn if he had a J. It's not like there's anyone else for him to scare away.

Hand 3:
I just call the 3-bet preflop and check/call the flop.

Hand 4:
Why slow down on the river? Do you think he raised you and called a 3-bet with a pair of 3s on that flop? I don't think he's slowing down with a set of 8s, 3s, OR 5s when it's heads up on the turn, so I don't think he's got a boat here, either. I would wager your jacks up is good against his 8s up.