id go ahead and 4 bet this, hes fos so often and kq is way ahead of his frequent 3 betting range. As played id just fold the turn and be unhappy about it. Against this sort of player start 4 betting alot lighter but play our big hands slow and give him enough rope to hang himself. however id avoid calling too much oop with marginal hands and checkraising on dry boards as youll end up getting in a spew war against him and thats never good.