While you can come up with reasons not to build the pot on the turn, doing so requires moving in the direction of over-thinking. You didn't play the hand the way you did to not build the pot when you hit your flush. You were assuming it would be good, and the only holding in the range you've given him that beats you is QQ.

Similarly on the river, you didn't play the way you did on the previous streets to fold to a small-ish shove on a blank.