Flop - Fine
Turn - Why not just take the free card? On the flop, you have a 33% chance of making your flush by the river. With 2 callers you are getting the 2:1 you need. On the turn however, you only have a 20% chance. Trying to get an Ace to fold is just too fancy. I can't see anybody going to 4 bets on the flop on a naked Ace.
River - Check behind. You may have the best hand, but there are a lot of hands that could have you beat. If you do, you aren't going to get a call from someone with a worse hand.