Indeed a proper R compound tyre will always be better on a hot and dry track. Sprint circuits are something different then the high speeds of a track like the ring. When I drive on a small track with small low speed corners, I go thru tyres faster then on a big high speed track. Maybe the difference between the Cup and Supersports are more noticable on the sprint circuits you drive? Also with a heavy tuned more powerull and more grip car like yours you are probably asking more of your tyres then my car (with almost OEM suspension and no engine modifications).
" i do what i built my car for competing on sprint circuits, timed runs on small to medium sized circuits and in this arena my car punches well above it weight,