Originally Posted by zipperfoot

Since everything else seems to be accounted for, My guess would be the diff or slipper is not adjusted properly. If the diff is too tight it can create a posi-traction effect. So when you try to accelerate out of a corner both wheels are spinning at the same speed causing a loss of traction and thus a spin out. Happened to me in the past. Having one of the fast guys set my diff properly did wonders for traction.