Thanks guys. Tony the CMI/II/III refer to the longitude of the planet that's on display - there are three different longitude systems because different parts of Jupiters atmosphere rotate at different speeds.
Check out this entry:
http://en.wikipedia.org/wiki/Jupiter#Orbit_and_rotation
David, I'll be moving up to a 16" mirror soon, that will help. Also a new camera is on the horizon , maybe for next year.
cheers, Bird