Hand 1
-I would raise this river, I don't expect him to shove worse 8x on us but he will call them

Hand 2
-If you're facing a bet and a raise definitely fold. If you're facing a bet and a call it's close. If you're facing just a bet its still closeish. Definitely not raising, sometimes c/c, but I think you played it fine.

Hand 3
-man with the way the game was going, AK is the super nuts. Your image at the time was more weak/tight than nit/strong range. Can definitely be 4betting bs here. I'm also tempted to raise this flop.