Thanks for the replys everyone
The asphalt lot we use is much newer than the concrete one, and overall it was smoother so it seemed to not chew the tires up as much. We also have tried to make an oval on a local tennis court (100% flat, smooth surface that probably wouldnt wear the tires too much) but every time we go there someone is playing tennis. We had briefly discussed TakeOffs/Sorex as a replacement for the X-Patterns, but we never considered the premounts, basically because of the wear factor. However SWTour's idea isnt bad, so that could be an option.