I like your flop and turn play. Once villain checks the river, I would expect you to have the best hand very often, so I would bet for value. I'd go a bit bigger, like 1,50, to get value from 99/TT and 7x. Once you get raised I would fold.

It's a really clear value bet on the river. Villain just happened to have 8x this time probably. Most of the time he has a hand that you beat.

With the turn being check through and villain checking river, I bet for value against a high, 7x and small pp. Fold to the overshove as played.

bet river larger imo. fold to raise.

Clear bet turn, cb/vbet river depending on actual card imo

I probably prefer just betting turn, still a lot of value & we can check back bad rivers.
As played i would b/f like $1.50

Im Would also go for larger sizing . U dont have many 3x in ur range so u might seem bluffy and get called by some PP.