hand 1-not qualified to talk about 4bet sizing but i don't think 4x's is the way to go, and 3x's seems totally fine. flop can just be a standard cbet size. no need to just shove it because he has like no outs in his range that we beat. if you wanna get fancy i like to bet like exactly half of my remaining stack 'cause that sets up for an oober easy shove/call of a shove while not blowing lesser hands out of the water.

hand 2 is a fold and i really don't even see how this is close. i'm probably folding JJ here too and i'm not even a happy camper holding QQ here. i mean it's such a small sample that i guess we'd have to continue with QQ here, but i'm like banging my head against the keyboard.

hand 3- i pretty much take a fold or steal policy in the SB of a bvb, but if villain doesn't know what a blind steal is then i guess i don't mind just limping here. as played i guess you could "donk" on the turn for protection because villain either has a weak pair, a FD or the nuts like 95% of the time. other than that i really can't see changing any other way you played the hand