I got my MTX-4 to work a lot better now. It's much more predictable than before. The biggest changes I made were to change to diff oil to 50,000, raise the rear roll center to the middle position and lower the front roll center 1mm( add a 1mm shim underneath the upper arm holder). I still have a lot more things to try before I get the car where I want it but I'm happy about how productive my last practice was. This was on a medium size high bite track by the way. The car still wants to traction roll easier than my V-One RRR, so I'm primarily concentrating on that.