the kk is totally fine
64 I understand, fair chance he has like 65 or 55 or even 89 or whatever until the river, and his river bet is only half pot so meh, iunno if you run into bluff 25% of the time but I get the call.

And in this hand you have the As so I can understand the bluff, don't necessarily think it's good but there's some merit to it

last two I think are complete spew, especially the TT hand, where I assume you're trying to bluff Ax or JJ-KK (but where I'm not even sure he folds Ax and where I don't think he plays JJ-KK this way). If it's a valuebet vs 9x I like it even less.

are you saying they are spew because villains will never fold, or because there are better hands to do the same bluffs with and bluffing those hands would give me too many bluffs?

TT hand was definitely not a value bet, and if a reg did that to me id put him on a flush and probably fold without blockers, so I thought id try to be balanced there myself and not only have value shoves...

Leffe completely outplayed you in this hand.
I dont like the river push after he did the check minraise on the turn.

largely because there's nothing in either hand indicating that villain is gonna fold
TT hand is a 3bet blind vs blind hand, I don't think he bets with ace on the river if he intends to fold, and you should be just as worried about the flush as him. I think his range for making a turn and river vbet are of the 'not gonna fold' type - if he has a hand like JJ-KK which would definitely fold to your push then he's not betting river anyway, prolly same with weak aces.

The AsJx hand I really don't like, with him calling flop and turn, him very rarely having a draw (with you having the As, he has almost no flush draws left), and turn and river being total bricks, it seems to me he's planning on calling you down all the way.