Dubonka

I'm having trouble with planes flipping over during loading, or a less severe case where they hop up and land facing kinda sideways. When they flip, they flip over backwards. It seems more severe with smaller planes. The only other mod I'm using that does anything to physics is FAR. I've tried using only stock parts and the problem is the same. I get some troubling wobbles on the VAB's launch pad, but I just have to wait a few moments before launching. It's much worse with planes on the runway. The problems were not present in a previous playthrough without KJR. Any suggestions?