How Would You Play this PLH Hand?

I think you played the hand well. As Natedogg pointed out, semibluffing with a flush draw is pretty common. In this case your hand is so strong that I think it's a good idea. I don't really know what to make of UTG's mini re-raise. He could be scared or have monster like top set. either way there is so much money in the pot you might as well increase your equity by giving him one more chance to fold. I can't believe he called his entire stack with pukey pocket sevens.

You made the right play by putting him all-in after such a meager raise. If he had a set, he'd have either flat called or raised the pot- his raise indicated just what he said afterwards, that he thought you had AK. You tried to reassure him that you did not, and he called his whole stack. I would have put him on one pair, and made the same move. I think that he made a huge mistake going all-in in this spot, and if you continue to get in this situation with him you will make money. If you only call, he will most probably know right where you are at. By calling a weak raise, you probably confirm his suspicions and cost yourself money if you do make a hand. I think you did right.