[Man of Means]

3-bet the flop. Valuuuu. Note that in huge pots (multiway with 12+ bets) you can be aggressive with impunity, especially on the flop because you want to increase your chance of winning and you have a large probability overlay for the occasions you are behind in this hand.

I don't like what happened on the turn, partly because (a) you under-repped your hand on the flop and opened the door for their aggression and (b) don't have enough information about the strength of their holdings.

You give these guys a chance to outplay you either by making you fold the turn OR possibly getting squeezed for more bets with a 2nd or 3rd best hand.