hand 1: definitely 3 bet harder. you are oop, so make it 9 or 10. and i would probably just check the river, because he either has a king, or some mid pp.

hand 2: definitely not spew. you have to c bet that. in fact, i bet harder, if they are as weak tight as you say.

hand 3: i like everything up to the river. with that min 3 bet it could be a lot of things, and that guy is a total donk running at 62/10. if you think he will call with Ace high then i would shove, but otherwise i would just check behind. im sure a lot of other ppl will lol at me for saying that, but oh well.