On dry pavement, the car is pretty balanced until you hit the limit then the rear starts to come around. I can push it pretty dang hard before starts to oversteer but once it starts, it's going sideways.
I had a person cut me off a few months back and I had to swerve to keep from hitting her (nothing sexist there. Guys do it more frankly). The car oversteered severely and when I dialing in some steering to bring it around, it just went the other way. I found myself sliding sideways down the road at 70 MPH and each time I went to staighten it out, it just reversed sides. It took about 8 of those swings to get it under control (less oversteer on each cycle). I call that oversteer. It didn't plow, it swung. What is interesting is the car stayed perfectly flat. No hint of leaning. But sliding along at 70 MPH perpendicular to the road does induce a high pucker factor.
Given that, it would imply the rear bar is already too large. I would think I would need to either increase the front bar or reduce the rear bar.
The tires are 245/60-15 Dunlops all around. They might be a bit hard from age (3 years old) and new tires would likely improve that.
On wet pavement, any significant throttle induces oversteer but that's different facts from dry pavement performance. I just stay out of the throttle on wet pavement.
I think I should put new tires on it and retest it. The tires could be skewing the handling more than normal.
After that, I can certainly swap to spherical bearings in the rear if necessary. I seriously doubt I will push the car to point where the arms will fold. I'm not *that* into road racing. I have no desire to drag race it either.