OK, let's take you out of the equation. Sounds like you have lots of experience in many cars and you are not Jeff Shoots, so you know the throttle is a volume knob, not an on/off switch:wink:
What are your hot tire temps? What tires are you running?
I think the weak LSD is a part of the problem. I have spent very little time in a stock 91-96 LSD equipped car, I have had a 97+ torque sensing diff, or a LSD packed with an extra spring (120+ ft/LB). Both of these sets could get inside wheel spin on very tight turns and full throttle. I run 275 RA-1 rears, so I need to throw the car into a corner to get the rear to step out. Once the car takes a set it's pretty easy to throttle steer it with out both tires spinning, unless the rear tires are above 42 PSI, then it's drift city! The OS Giken 1.5 I now have is the only set which seems to not let the inside wheel spin.
Stock size tires are more temperature dependent from my experience...
Another easy thing to try would be to unbolt one upper link from the rear sway, zip tie it against the knuckle and see what the car feels like then. That will give you the most bite you can get with both rear tires. Might be an interesting data point.
I have to admit, the first thing I have people with their car is lower it and put stiffer springs on, so the stock ride height is not real familiar to me. I know dropping the car by 20-30 mm makes a huge difference in reducing roll, and helping maintain tire contact patch in hard corners.
