AA first hand facing resistance

[casmells]

UB 11$ turbo 10 person sit and go.

1st hand. 1500 stacks, 10-20 blinds.
I am utg+1. 1 fold, I raise to 150with AA, 3 callers.

flop:9,7,3 rainbow, about 600 in pot.
I bet 400, 2 folds, LP raises to 800. Hero?

do i really give this unknown credit for a set and fold with all these chips already in the pot? I see alot of people do this with any overpair at this level.

Just curious what other players playing 11's would do here.

thanks in advance