[fetus]

I had a 2.7 with the same problem. I now have a 3.2 and created a bigger problem.
My car is a daily driver and I am a bad driver that needs more autox and drivers training.
Believe it or not adding a rear stock sway bar eliminated the problem.
I started with the following:
Front
-21 mm torsion bars
-22 mm adjustable sway bar all the way in
205-50-16 tires
Rear
-140 lb springs
-245-45-16 tires
Stock rear sway bar.

I first tried the above with no rear sway bar and 180 lb springs.
The car still spun out.
I then tried 140 lb springs and no rear sway bar and the car still spun out but not as bad.
I then added the rear sway bar and now I can get a little bit stupid on the throttle in a corner without it spinning out.

I was told by everyone that a rear sway bar is bad.
Ahwell....

Steve