Hand 1- you don't need to make it 40 cents PF against his stack size, 30 cents is more than enough.

Hand 2- PF is too small, 1.25 minimum

turn play seems awful, my guess is you got to the turn, were scared that if you checked he would bet and you would have to make a decision so you shipped KK. However, this bet is bad in the sense that he'll never call you with a worse hand and he's never folding a better hand (Jx 7x). Also, would you ever ever ever take this line with a full house or quads?

Hand 3- I don't know why you posted this, you took a bad beat, it's happened before. This is not the sympathy forum, that's why we have a "tilt" forum.

Hand 4- PF is fine, turn is awful, just fold 5 ways. I dislike the overbet on the river with the action in the hand. If you had like 55 and the river was a 5 I'd like it a lot more because 6x is quite a possibility in a 4-5 person pot. However, after everyone has shown such weakness I'd make more of a 1/2psb designed to get looked up by like 7x.