The temps must be the reason for the increased grip. The LCD display show very easy tire warming in the FISI. I wonder if the belt driven guys feel the vibration with the same intensity. If you flat spot the tires now, the G27 gives you away for everybody in the house Pretty fun. Also, after you flat spot the tires, now they keep going for like 13 laps with the FISI. Before, the front tires would not let you turn. Vibrating but hanging on.