raise size preflop is fine. You could make it $3.50 since you are OOP, but its fine. You CANT bet so small on such a draw heavy flop. You have a good hand, but there are a ton of hands that will complete on the turn and you want to price them out. Bet $6 on the flop and probly fold to a push. You only really beat QQ/bluff here so you cant really call the raise as played.