UTG vs BB

You could have checked that flop.
Your second barrel should be bigger, but do you really want to fire it as you're gonna need to fire a third one in a spot where you don't know if he's gonna fold his medium PP ?
I mean, the worst line would clearly be bet/bet/check, always losing to 88. But bet/bet/bet at NL5 with AK is often more FPS than anything else. I like check/check/check or bet/check/check.

On this kind of boards villains will fold a lot. For that reason I like that small flop cbet.
For the same reason I kinda dislike the turn barrel. Especially with that sizing. And as Floxy said, now the river barrel is required. But I dislike the sizing again. I think now we need to go big to get those folds.

I like check/check/check or bet/check/check.

I agree with these lines. Often I dislike check on all streets because villain is so weak that he is often going to fold. But now we have some showdown value with AK high so maybe it would be good.

I agree that the flop c-bet is standard on this board.
I think sometimes you can bet on the turn too, only sometimes. Anyway, I think the best line would be bet, check, check.

bet/check/check seems like the best option here...If you decide to double barrel, don't bet the river without very specific reads - he will most likely call down and we don't have enough showdown value vs hands that call a double barrel.

I totally agree that bet-bet-check is the worst.
Bet check check is the standard one I use.
Now I would like to discuss sizings. I have to improve on that matter.
Betting very big would look more suspicious than smaller sizes imo.

Okay maybe the river sizing is ok. You want folds from pairs under TT. JJ and QQ probably won't fold anyway OTR.
But what about the sizing OTT? Should it be big enough to make FDs and those pairs fold?