Your replies are both very interesting, thanks!

hand 1 : I have AQ from SB, I flat called his button PFR thinking I would fare better against his 15% range. Retrospectively, if he's positionnal aware his range will be much wider from BU and a reraise preflop will be better.
On the flop, it strongly hits a +15% range but misses a wider range.
Therefore I would say 3bet if villain is positionnal aware (by checking steal attempt stat?), as played floating is fine. If he's not positionnal aware, call pre and fold flop or turn?

hand 2.1 : I think IOPQ got it right, there's no point of calling a tight PFRor with AJo, even with position. Reraising flop is so so, there are a lot of overpairs he's not folding or even high hearts.

hand 2.2 : Floating flop and betting turn if checked to seems a good and cheaper idea.

hand 3 : Same question of 3betting oop wi AQo as in hand 1. Villain is even looser and trying to isolate a loose limper, so 3betting might be better here. I was lost about to fire a second barrel or not, much harder to bluff oop!

hand 4 : As you said, bet turn scarce A stronger, c river

hand 5 : His line and the river check looked like a missed draw, the K seemed like a good scarce card too and i have zero showdown equity. A 3$ needs to work 2 times out of 3 which is a bit optimist against this loose player. I think a half size bet might be +EV.