OK, comments from the first video:
As predicted, I don't like your call of the min bet with your set. I have no problem slow playing on a dry board against someone with an obvious hand who will fire again on the turn, however in this spot I think a raise is better. A min bet here either means villain has a monster and wants you to raise, or a weakish hand that is scared of the ace. If it's the latter, you're never getting value from him, but if its the former you want to raise so you can "fall into his trap". Also, flat calling on the flop and raising the turn looks super strong, so unless he really does have something you aren't going to get much value. If you raise the flop, he might feel like you are "sensing weakness" and look you up.
On the KQ two pair hand after the flush comes in, I probably don't bet the turn. I feel like you can still get the same value from a K on the river (more, in fact, since you'll have looked weak) and I don't think you're going to want to 3 barrel into that board. After he c/r you I don't think the fold is nitty at all. He most certainly got there.
Now on the other table folding KQ to a minraise by a 42/12 IS nitty
The JJ hand vs the 2+2er is interesting. With what frequency to you think his is 3betting you with AK? If you think 3betting with AK is his default play, I'd probably be lead/folding the flop, and certainly leading the turn once you pick up the flush draw. As played I think you probably have to fold, but I think it was too passive vs. someone you say "will 3bet with AK".
On the QQ vs. the short stack I agree with your play, including the smaller than normal re-raise. However, after he pushed you did seem to consider the call a bit. Against this stack size you should realize that your raise is putting him to a stack decision and you should know what you are going to do before you 3bet. Of course, your comments might have been for the sake of the video, but my thoughts before the 3bet would have been "he's short, I'm going to 3bet and commit against him, if he pushes then I will call- if he flats I am probably shoving most non-ace flops."
You folded AJ to an open limp from a 40/10 in EP. I am usually raising here because your hand is way better than his limping range and there is a ton of value to be had if you can isolate him. It sucks when someone flats behind you, but this kind of player is worth taking that kind of a risk to isolate, I think. You talk about the gap concept, but I don't think it really applies here with this kind of a player. He is waaay looser than you, has displayed weakness by limping, and you'll have position on him.
So those are my thoughts- hope I don't sound overly critical; just trying to be helpful. I enjoyed the vid and it was cool to hear how someone else approaches the game and what your thought processes are.