for chad Bradley... he never used more than 5K for the rear.well, as published in his setup site.
i believe only Yannick Aigon, The RB, Xray guy, use thicker diff at rear.. becoz he said he got lots of steering from the xray & his driving style.
arghhh... LKH also use thicker rear diff 10K, for the borneo cup race. i think he got points there. he end up 2nd with X1CR + RB combo
*** i use 5K, 7K, grease+1K (X1CR+STS 21BT)... i also end up same lap with him at qualifying
...
does this point count