11.0 was on the 180 shot if I recall correctly...and yes, Colorado air is thin, and the DA in the summer goes over 9000' on a regular summer day.
My current stroker motor runs low 10's NA on e85,....needles to say, I like the current motor the best :)
Edit: Don't forget to run a colder plug than normal, like an NGK -9 or possibly -8.