The thing about good hands on scary boards is that the board is often scary for the opponent as well. Put your villain on a range of hands and think about how the money goes in here and how it doesn't. If your opponent has AK here do you think it's better to raise the flop or wait? What about if he has JJ-KK? he did 3bet you pre flop so why are you worried about a flush draw on the flop?