check den fold, worst card in the deck if you were ahead, his flop calling range is like AK/KQ/KJ/9T/77/88

16/11's aren't flatting K9s here and KTs should be discounted as well.

You cannot discount hands like AK/QQ/JJ against nitty players like this, in fact my standard w/o some 3betting history would be to flat JJ/AK a decent% of the time in this spot.