was this fastplay correct?

[mike l.]

i had 6d6c in ep in a very good live 5-5 $500 max buy in game. i limped, two players limped behind me, the sb made it $30 to go which was not super meaningful since that's a standard raise in the game and many players do it with all sorts of hands. i have about $1000 and all 4 players have around the same. i called, and the 2 players behind me called. 4 of us.

the flop is Qh7h6s. sb bets $40, i make it $200 straight. one of the players behind me thinks im FOS from a lot of limit we've played.

how's my flop raise?