hand 1:
Preflop
villain has 180$ and i have him covered. He is running at 44/3/0.3 so he is quite fishy. I raise to 8$ in MP, rest of table folds, SB calls and villain in BB calls as well.

Flop
Pot: 24$
SB checks, villain leads 8$ and i decide to raise to 24$ If he is trying to get a cheap draw. SB folds and villain calls.
Turn
Pot: 72$
He leads 20$ I decide just to call. If he has a draw i can fold river but at this point Im scared that he has something better since his aggression is so low.

River
Pot: 112$
He leads 30$ and i call. Would this line be OK if I had AK(so i would beat AJ and AQ?)
what does the villain have here?

hand 2:
Preflop
Villain has 98$ and I have him covered. He is running at 24/18/1 after 37 hands so sample is not representative enough. UTG limps, rest of table folds and i raise in SB to 14$. Villain in BB is the only caller.

Flop
Pot: 30$
I lead 24$ he instapushes for 60$ more. Hero?

Hand 3:
Preflop
villain has 98$ and I have him covered. I have no hands on him so basicaly there are no reads. He is in MP and he minbets 4$. I decided to raise it to 16$ in CO with . If he was a 75% stack i would raise to standard 20$ when I'm re raising minbets. Rest of table folds and he is the only caller.

Flop
Pot: 35$
He checks and I bet 24$. Its somewhat weakish bet but he doesn't have much behind(81$) at this point. I guess 28$ would do better. He quickly miniraises me and I decide to push...Thoughts?

I'm not sure how to play TPTK hands vs these 40-60% stack players. If he has less than 40% then I'm folding TPTK just about never if board is reasonably good for my hand. But im not sure how to approach these middle stacks.