RE: Tuning the Single Cam?
Correctly spined arrows,
Draw length (it will change over time - string stretch),
Draw weight (it will change over time - string stretch),
Correct tiller setting,
Correct cam rotation,
Nock setting,
Center shot,
Correct spring tension (if it has one) on rest,
Make sure your axles are lubricated,
All of the above will help you be as consistant as you can be.
Did I miss any?