Just ran my T4 for the first time today.
I used the included baseline carpet setup included with the kit. I was running on a short indoor carpet track with no groove set in yet. CS-22 tires.
Having on-power understeer and off power oversteer. First I decreased rear droop and then subsequently took out the rear ARB. I didn't see any large improvements. I wonder what to change next... I wouldn't be so concerned, but I feel I'm pretty far off a stable car with the stock setup.