Hand 1, you don't bet the turn because you don't want to give him a good shoving opportunity? kind of manouvering the pot and stacks so you can be the one shoving in these situations, where ranges are wide.

Hand 2 I like, given how drawy the board is and how small you bet, and him just flatting, makes his range a lot weaker in my eyes. given the turn, you have enough equity when called to give you enough FE to make this a profitable shove, especially with your read that he's competent.

Hand 3, this is a snap snap shove here for me, look how big he 4 bet!!!! especially after you have 3 bet him 3 times in a row his bluffing frequency here is going to be huge.