With the SSG, I had to run more pre-load on the left side, the side with the cells and therefore the most weight. I'm suprised that you had the car riding level unless you did this already? Be sure to measure ride height using the gauge from the side or on the diagnal on all four corners of the car.
With the RS conversion, the pre-load is more even all around. I think this is because of the revised position of the cells and the fact that the chassis is stiffer.
Regards
Horatio