By the way, I think when they say 30% expo, they probably mean -30 don't they?

I don't know how Hitec does it any more. I had an Optic 6 but can't recall if - or + was more or less sensitive... Easiest way to check is to fire it up to 100% and see if it's super sensitive around center or seems to be really sluggish around center. The normal use for Expo, especially on a 3D type plane, is to calm down the controls around center so that you don't over-correct like crazy. If you go the wrong way, it'll be SUPER sensitive and likely hit the ground very quickly in an involuntary manner.

-Eric