Try slowing down in the corners.
If you really want it to slide, you can try any of these: take some droop out of the rear, stiffer swaybar, less rear toe, stiffer rear shocks, rear brake bias, shorter rear camber link, lower the inside end of the rear camber link... any of those will take away rear side-bite.
Frankly, you have a problem that I only wish I had. Too much traction is against my religion! I don't believe there is such a thing!