right now the bike is actully running pretty dang good considering.
Don't waste your time. Do it all at once. Assuming you are sending them to SISF, and its "running well" at the moment and not leaving a puddle on the ground, I wouldn't do a thing other than save my money. Any parts you buy other than new air boots and cable will probably be wasted. You will have to to pull the carbs out to get to the bowls out to replace the bowl o-rings (most-likely the bowl screws will be destroyed if you don't pull the carbs). If your air boots are hardened,
you will need them before you put the carbs back in unless you have two pet gorillas and a heat gun for assistance. As for syncing, I would bet when the carbs come back they are extemely close to being synced and they will run great out of the box as long as they are not abused when they are re-installed. I little adjustment tweak later from a friend wouldn't hurt.
When you do take the carbs out it is also a great time to clean and inspect the airbox for cracks. Quite a few have been noted to have a crack on the front bottom seam. It is repairable with RTV (and sheet metal with pop rivets if you wish for extra insurance) to make it air tight again. If you need to do this, clean it well (brake-clean) so the RTV will stick. Also a good time to add block-off plates and also block the hole in the airbox where the hose goes thru.
You can adjust the valves while the carbs are with SISF.