IMO the 8.5:1 compression is a bit low. I would go 9:1 if you mostly want to run pump gas, 9.5:1 for a bit of both, and ~10:1 if you plan on mostly running race fuel.
The one good thing is the 8.5:1 will be a lot more forgiving to tuning mistakes then say a 10:1 setup.
Thanks for the input. I was thinking about going to a 9.0:1.