I don't claim to be a guru.
If a shop did the major tune up and the bike doesn't run right, I'd think about taking it back to them.
If there was a slight hesitation after the carb cleaning, and a can of sea foam seemed to take care of it, then I would question how thorough the carbs were cleaned and maybe they need to be cleaned again.
I'm guessing you bought this bike used.
Did the bike exhibit this trait prior to the tune up and did that make any diff?
I'd make sure all the vac lines are attached and in good condition, as well as checking the carb to boot clamps.
You didn't say if the carbs had been synced.
What year is the bike because if older you could have a coil pickup problem. I did, where one of the wires was intermittently losing contact at various rpms.
I'm not sure what you mean by vacuum valve. I'm not aware of anything that lets air into the exhaust.
Brighter headlight bulb - I'm not sure if there is a Silverstar option but I heard those are good but the life is shorter. There is another option to go to a higher wattage bulb but I believe to be safe you will want to replace the headlight wiring harness or something to prevent it from melting. I believe Murphs Kits has a kit.
http://www.murphskits.com/catalog/product_info.php?cPath=1_28&products_id=102