interesting you think the newer cup2's might be a different compound, gt3. im on my second set of cup2's on the 997 gt3rs and bought N0 spec as not much difference in price.
my previous set ( fitted oct'14) were not porsche spec and i found them very very good on the gt3, needed to get pressures correct, usually about 31F and 32-33R, but wore very evenly, lasted 9 trackdays on front, rears were good for a couple more probably, think fronts wore more as faulty pressure gauge ment i was running them ~27F which was too low
the N0 set i have on now has a little more understeer and dont feel quite as stable, but still very good. about 50% worn after 4 trackdays, so quite similar to previous set.
id put the lower grip feeling down to being N0 rather than normal cup2's
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