You're probably right, since my average lap time was 2:09, not 1:05 (Grand Valley, not Tsukuba). Makes me consider going a bit easier on my own street car, considering what the tyres cost

Toyo Proxes T1R could be Sport Hard/Intermediate?
They are probably Comfort Softs. I think even the sport hard tires are true r-compounds.
My guess for each category:
Comfort Hard - run flat all-season tires, or those economy tires that are meant to last 60,000 miles before wearing down at all
Comfort Medium - your typical performance all-season/entry summer tire, like the Continental Extreme Contact
Comfort Soft - seems like fairly high performance summer tires, maybe even the Direzza Star Spec. There's a big difference between these and comfort hards.
Sport hard - your typical Toyo RA-1/r888, Advans, Nitto NT-01
Sport Medium - Hoosier R6, Kuhmo v710s, basically your top of the line r-compound tire found at time trials and HPDEs
Sport soft - insanely fast, probably even faster than Hoosier A6 or Hankook c214 c91
Anyway, that's just my opinion - back to the subject...
I've completed the first 2 races, did them this weekend. The roadster enduro was punishing. I had to split it up, like a long drive to a boring relative's house or something. I took my spec miata (search for this thread, it's a neat competition), and just banged out 1:08's all afternoon.
I hope that once Bob gets to the enduro races, specifically the 24h ones, I can just leave him out there and go skiing for the weekend while he drives his little heart out.