Your draw is pretty much the only one out there so the only reason to raise flop is to get 88-TT to fold, but too often he has set / 2-pair / str8 & blows you off your draw, so calling is better.

When he bets the turn again I think he almost always has 1 pair beaten. Your hand is quite well disguised so its best to just raise it up now.

As played the river is a fold against solid opposition, though I can definitely see myself calling (& regretting it) against an unknown.