Eugene, When you calibrate for one click of the MPG, how many clicks show up in the box? If you see more than 'one', you could very well have a noise issue in the MPG wiring. Also, after going through what Hood is telling you, try another calibration and don't spin the MPG for fast but just turn it as you normally would then try velocity only in the jog MPG window - top one, and see if that makes a difference. You should see 10% or something low for good slow control.
I've had a heck of a time setting this one up due to similar problems but I fought it on my own without asking for help here - you're ahead of the game already!
Bill C.