What makes you think villain is bluffing? If not bluffing, what makes you think villain is folding his AQ, KK, KQ, QQ now with 4k committed and 8k behind in a pot that now will double him up if he wins it? Seems like you'd be better flatting with the expectation that if you hit one of your 11 solid outs on the river you'll still get paid off on a value bet and if you miss the river you can still check it down and win if he's bluffing.
