It started this after I replaced the o-rings on the intake boots and had to re-sync. I am wondering if some of the issue here might have to do with how I synced the carbs. They say that the level of vacuum when you're syncing isn't important, just that the cylinders have certain relative levels. Is this entirely true? Or if I synced by bringing the vacuum level up on the carbs that were low (rather than down on the ones that were high) could I have leaned the mixture? Or could the way the carbs are synced adversely affected the way the bike idles?
This is the first time in a while I've really had the bike sealed right since I put new slip-on JC Whitney mufflers on it. I may just need to enrich the mixture a bit. Any thoughts?

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