Hand 1 I play pretty much the same, surprisingly crafty oppo.
Hand 2 I can't say I;ve never made the crying call down there because of course I have, but with multi oppos hanging around, don't get caught in the middle if chips start flying. If I'm really sure I'm cooked, then I will fold, but if you ever get it wrong and cost yourself the pot it feels a LOT worse than calling 2 more bets.
Hand 3 OK as played. If you had position in the hand, you could think about checking behind on the turn. If you do, you have to call his lead on the river obv, but that works out at 1 bet rather than 3 if you have reason to believe he has it.
Hand 4 You get some nice hands on the button dont you?! 3bet. Take control of the board. It doen't do you any good as it happens on this occasion