I believe 460 spun his tire first, then added the amount of weight that the spin balancer said was required. I was just thinking about this same topic, so I'm very interested to here what others have to say!!
"ZOMB3" Aug. 2012 Fury of the Month
Sumo X kit, Platinum air ride, DLX Grips & Pegs, Billet Blade Levers, Spike Intake, PCV, Raw Designs Blades, MFR 3" Forwards and Pipe. 23" front wheel, 10* trees
Stock tire calls for 2 oz in the rear tire and 1 oz in the front, and that's what I have in mine. I would buy 4 oz all together but try only putting 3 oz in the rear and 1 oz in the front and that way if you need more you already have it on hand.