Thats wierd, my indoor medium bite track as soon as i did the shaved brace and c-hub mod the car felt 10x better. Had a lot more rear grip and was more consistent. Currently im running 1mm with shaved brace and the middle hole with the C hub and i couldn't ask for a better car.
Before i can the stock hubs with 0-2mm spacing on the u brace and i couldn't get the car to stick right in the corners or feel right coming in and out of corners.
Sure the car doesn't rotate atleast on power as well but i just drive accordingly and it does what i need it too, it actually allows me to drive it more like a touring car feel and just relax and just let the car do the work but if i do need to drive strapped i can fling it into a corner with a lot more confidence then without the c hub and shaved u brace mod