Okay--

Hand 1--villain appears to be a bit of a nit. He calls your raise oop, check calls the flop (if he didn't have a piece of it, or an overpair then he probably folds), then check bombs a scare card on the turn. His range? Sets or combo draws on the flop. Draw comes in on the turn, but he also picks up another diamond. He's probably not doing this with QQ-TT, and if he's doing it with AA (again not likely due to PF action) then you're still beat. Most likely hands, in order--66/56/88/77/44/46/86/oddball combo SF draw/AA.

Hand 2--villain calls for the first time in 28 hands, with another caller sandwiched. Can't totally discount high pairs I guess. Range is weighted to smaller pairs, sooted connectors, connected cards. Flop comes low, he sees your cbet, and a call, and still raises you. Most of his range connected with that flop, and you are flipping with the part of his range that didn't hit.

Hand 4 I already gave reasoning, but it certainly looks like he hit his set on the flop. However, I'm not good at folding AA either, especially getting better than 3:1 on the river. I call as played but expect to lose fairly often.