excellent reply clegg!!!
I too have sunk a lot of $$$ into the rs4-3ss to make it a short track parking lot racer. I will be racing this next spring and I think it will be very competative with the other "pro" cars out there. But for longer ROAR spec type races, we also have a Kyosho V-One RR Evo.
Modding this car has cost me a lot of money but I now know every square inch of the car.
Clegg, I noticed in one of your previous comments that the rear alum hub carriers were from GPM. That maybe your problem with them. Nearly every part that I have bought from GPM has something wrong with the design. The quality is very bad even though it maybe cheaper. I bought the HPI 2deg alum rear hub carriers (more $$$) and they seem much stronger and a true 2 degrees. They also come with set screw to tighten them to the hinge pins. Excellent so far.
Did you also try changing the rear roll center by changing the angle of the rear camber links?? Once I adjusted mine, I can tame the rear end much better. Very little oversteer. I also modified an XRay T1 rear sway-bar kit to fit it to the front. Have not tested but seems very effective with the stiff proceed springs I am running up front.
Once HPI releases a rs4-4ss, then I will upgrade this car!!!