It depends greatly on the CG you choose to fly with, but this should get you in the ballpark:

Elevator high rate should be 45 degrees of travel and -60% expo.....call this 100%. Low rate will be about 25% and expo optional.
Rudder will be high rate 45 degrees of travel at 100% with -60% expo. Low rate about 40%.
High aileron should be 35 degrees of throw at 100%, and about 25% on low rate.

These numbers will make sense if you set your function rate to 100% and then adjust the high rate travel using ATV. For low rate you then alter your function number to the lower rate. Some radios don't program that way, so let me know if your's doesn't and I'll adjust the numbers to match.

CJ