Can't say with the Perilli RF but I did have the Perilli sport demon on the front. I tried the BT45r on the front and like it much better then the sport demon.
Others on this board have far more experience, but so far this is my limited experience with being double dark from day one here when I switched over.
I have a Stone 706 on the front with 8000 miles on it still looks good and no cupping. I don't know how many miles it had on it when I got the bike. I'm going to mount BT45 when this one wears out. :coffee1: