Alright, been attempting the b-spec 10 lap 700pp race at Le Mans, haven't had much luck, but the key does indeed seem to be Sports Soft tires. Took 8th without much effort in the GT-ONE, would have taken 4th (or better) with the Minolta 88 Toyota monster, but I pitted to see if intermediate tires would help. Didn't... ended up completely wearing through them in 4 laps.