YIKES!!!! Very detailed write up but the reason I was dreading ripping my carbs apart and as you may have read, many have already reconditioned their carbs and are having the same experience. Try reading this first and you may solve your problem permanently:
http://www.nabble.com/Probable-Solution-to-the-%22Firing-on-One-Cylinder%22-Issue...50MPH-at-WOT-No-More!-to24692447.html