Yeah, I had a look at the setup I was using for the mid 38's. I couldn't match it within rFactor's setup. Just going with the base setup, and what I could adjust without hand editing the file, I can't any better than like 39.7. The gear ratios I had in the 38 setup weren't available. I will note that like 39.7 was good enough for pole at the 2007 Indy 500.
With a "clean" setup, I'm reaching like 380 at a the entrance to turns 1/3, and out of 2/4 about 360. I'm also trying some different camber/tyre pressures, to see if I can get a bit more even temps. I'll see what happens.