You can't be judged on the rate of the roll (too fast or too slow) However, you can be judged on a CHANGE in your roll rate thoughout the roll. I'd kindly ask the judge about this. Perhaps he meant he down graded someone because he finished the roll too fast (i.e., faster then he started the roll). Even then a change in roll rate is a deduction that still would not result in a zero.

Take Bvmjethead's advise and download the judging guide. Trust me you will learn a lot. Take it with you to the meet so if there is any question to a rule, you can share it with the judge(s).

As for your original question on spins. They can be tough maneuvers. Each plane can fly them differently so there is no easy way to tell you how much of each control to use. One hint I have learned that helps is that once your wing actually drops, let your elevator go back to neutral as you add in your other controls usually full ail and rudder). Practice them a lot and if possible, have an experienced pilot and/or judge help you out when you practice them.

Best of luck..............Mark