To echo Jerry, panhard bar makes the bushing issue worse in my experience as well. More bind to an already binding suspension. Pretty sure I've got sphericals in the housing (I'd have to check and I can't find a picture right now) and stock uppers otherwise now. I ruined a full spherical upper arm running PM3L and went to stock arms and ordinary 4 link after that, got tired of welding the car back together after every event.

Since switching halfway through last season I have not had an issue with it.

- Josh