First of all, you should be playing with a full buyin, no matter what.

I don't mind the pf raise with KQs in UTG+1, you shouldn't be raising pf w/ only AA, KK, and AK in this position.

Flop action looks all right, you may want to consider a semibluff raise, as you have a 4flush and two overcards and decent position. Especially since you said the table is passive, you'd have a good chance getting them to fold to a semibluff. If not, oh well, you swelled the pot for better odds on later streets.

Turn action is good.

I'd say 3bet push the river. Probably made a straight before he made the A-high flush.