if you raise pre , cbet the flop , You're repping a big hand raising from the BB so bet about 2/3 pot. If you get called and whiff the turn you can always check then. You hit the turn so be 2/3 again. You have to make the draws pay to get there. If you bet too small you make it less of a mistake for the draws to call or if really small/checking then its correct for the draws to continue. Betting lke this would get you headsup probably at the river and then its a real shitty spot.I'd probably bet 1/3 of the pot and fold to a raise.