The difference in grip between an R6 and shaved RA1 is worth 2 seconds a lap on my car.
I am Hoosier fan and they sponsor me.. But I want to try and keep the "real" data out there. What you are quoting is not factual IMO. There is not 2 seconds worth of difference in R6 and proper RA1's at ANY track I have ever driven over the last 8-9 years in a SM. Maybe something longer than Road America at 4 miles full of turns? It is much easier to get to the limit on Hoosiers than Toyos? Maybe that is what you are experiencing? Are you ion 3/32 or thinner Toyos ?