I have always moved them both the same, on my Revolt-X and Solution. But I find jmez's info to be interesting and will now have to play with that. I have always been successful tuning by moving them both the same though.
I set centershot by measuring to center of arrow from front and back of the riser. Revolt-X comes out at 3/4", Solution comes out to 11/16".
Cams are set to "factory center", which on my bows is set by moving cams as far right as they'll go, then bring them back left two full turns of the adjustment screw.
Then I shoot bare and fletched. I adjust rest height to get vertical correct first.
Then I adjust horizontal. I move both cams in the same direction. Bare left of fletched, cams move right. Bare right of fletched, cams move left.
Then I verify with fixed BH's. So far, I have never had fixed not hit in the same spot if I already had bare and fletched hitting together to 30 yards...aside from one time when I found out that cam timing was off.
Both bows have always tuned within about a 1/4 to 1/2 turn of deadlock adjustment.