Mark07,
If the model flies anything like the RealFlight G2 sim version, 7/8" should be fine and not too sensitive. The roll rate on the sim version is slightly slower than what I was expecting. If you have Tx supports dual rates, I suggest you program high rates at 7/8" and set your low rates at something like 1/2". Please note, I haven't flown my model yet, so these are just estimates. Can anyone out there with a flying model weigh in, please?

Lurkers,
My belly pan fits perfectly. No trimming required.
I've installed a YS120AC with a Slimline Pitts Style muffler and extension kit. Pictures to be posted soon.