The wide rear track mod U4114 uses longer rear driveshafts and spaces out the suspension blocks, it kinda locks in the rear end. The steering mod U4113 is also pretty good and reduces the slop in the steering.
The lack of rear grip could be down to what surface your running on and tyres your using, if its wet astro and your using Schuey yellows then I would expect to have grip issues. Are you running kit springs and shock pistons?
Camber links and positions also have an effect on how your car rolls, you could try and shorten the front and rear links to see if that helps. To see if it helps and if you don't have the option camber links lower the inner ball stud which will have a smaller effect than a shorter link but will point you in the right direction.
Roll bars may help but I always feel that they seem to remove some grip if you only use one at one end of the car. I used to use one sometimes on the rear but I never had issues with rear grip.
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