How does it respond at the 3/8"
My concern is that 3/16" is going to be unresponsive, and then kicking it into high rates at 3/8" will be squirelly. (spelling?)
This isn;t like most of the extra's out there whith large oversized control surfaces. This particular model has the typical "strip" style control surfaces you would find on trainers.

THe person I obtained the aircraft from is an "alien pilot" and can handle anything. His throws were setup lock to lock, which will be way to extreme for me.
I've never owned an Extra before, so perhaps the small throws are the nature of this plane.
I've mostly flown .60 size cap 232's and chipmunks which generally have larger throws than what this calls for.