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Vacuum synch is to synch the jetting together not the throttles. Throttles should be synched before you put the carb on (or never touched from factory), the vac just makes sure you are pulling the same vac (running as strong) on both carbs. The closer you get to perfect tuning the stronger vac you'll pull. You can just turn the screws in and out and hear the idle pick up, but the vac gauge takes some of the guesswork out of it.
I don't really understand that quote but apparently the poster who has built 'blueprinted race engines' thinks that the vacuum gauge is use for adjusting the throttle balance screw? Its not, its used for the fine jetting adjustment.
Even still when adjusting the pilots, I do it with the bike fully warmed up and i give them an extra touch of a turn to the rich side just so it tips in off idle a little better, and runs better on cold starts. IMO your perfectly tuned when your cold idle is a little bit higher than your hot idle.
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