Armisan

Simple turn decision, or is it?

While your turn range is narrow and consists of value hands a turn bet is the best option both for value and protection against flush draws and overs for when you have TT-88.

Considering changing to 6max

In a 6 max you will on average have more marginal spots, then in FR just because your range will be wider to begin with (you get 6 hands instead of 9 hands per round), so it involves more skill....

Stacking off too light?

so standard 4bet is like 2x?

Guess im gonna slow down with the AK all in pre

This is not a good decision. AK is an awesome semibluff hand. ...

bad call on river?

My point of view is that villain looks passive and probably would check back all the hands you beat and bet 2pair+ hands so I don`t think ch/calling is good, shoving the river might be better op...

Looking for feedback on a few hands

Looking at your hands and responses I get the feeling that you have very little understanding how the game works. My advice would be for you to move down to lowest stakes possible, pick beginner...