I'm going cold 4b or fold when OOP to the 3!er, and JJ is around the bottom of that range HJvCOvBB. (Although this is dependent on players' exact frequencies; this is where specific HUD numbers would REALLY come in handy...)

Even IP, your flatting range is going to be a VERY tiny sliver, and you're better off not having one at all unless you're super studied on what that sliver looks like.

Postflop is played well.