3 handed, NL50 hand

[Go_Blue88]

Villian (~60) raises to 2, sb calls, Hero (covers) calls with 78 of spades.

Flop: Qs 6 9s

Sb checks, hero checks, Villian bets 6, Sb folds, Hero raises to 20, Villian pushes, Hero quickly calls.

Did I screw up this hand? Villian is very tight...it seemed that I might have some FE here. Maybe make a bigger raise? Does this type of play not work very often at NL50? Thanks...