I know you had your reasons for flatting pre, but I have a rule, and it's don't play suited connectors OOP ever. Every time I think about it, I yell at myself to prevent myself from playing that pretty 5
6
from the SB. I think it's -EV. You get yourself into too many marginal spots post-flop. If I'm going to play it, I'm going to 3bet, but to me it's a fold pre here.
As played, thinking villains probably know the only non-nut queen you continued with on such a scary flop is AQ or maybe QhJh. Your turn raise is also suspiciously small to thinking villains. If you're really a lag, 30 minutes should be enough time for a competent villain to see that, and also to know that you probably 3b AQ pre and possibly QhJh too. If you flopped the straight, you'd have raised the flop for sure since it hits villain's range so hard.
That's kind of a word salad, but basically. If you flopped the straight, you would've raised flop for sure unless you had exactly QhTh. If you turned the straight, the only hand you would've feasibly continued with is AQ, which you would've 3bet pre. Therefore, the only feasible hand you're repping on the turn and the river is QhTh.