I would bet bigger otr

firstly i would start with pre, after a BTN raise and the SB calls you should be SQ with AJs

which allows us to lead flop if called, as played i like checking to the OR, we can then call if he C bets or C/R which would be my preference with such a big draw,

on turn, i think you played it fine

on river like nickhalden said i would deffo bet bigger than less than half pot,

Yep esp rvr is where river bets really starting to add up, in this spot I don't see you are getting that much action from really weak stuff so I'd increase my size. SB is likely weaker and calling too much.