Clamps. No more than snug tight with the carbs fully inserted into them. I doubt that's it, b/c you sound like you know what you're doing. But the air leak could also be on the other side of the boot, between the boot and cylinder head. That's common. Test for it.
All four needles should be set uniformly too.
Something's definitely out of spec if you have to run >3 turns for it to run properly. Does it idle smoothly and/or are there any indications from the vacuum sync tool that there's a problem in any of the cylinders?
Alright! Trading bikes for a while was fun.I'm ready for mine back. No, seriously, get off my bike. Ahh, what a privilege it is to have such a sweet ride.
At the track she's said to be outclassed, but on the street, she reigns unmatched. She's the only big-bore canyon carving hypermiler I know of. -- Picture gallery
, K&N air filter, SuperTrapp
Aluminum Racing Series exhaust (Made in USA)
, ZG touring shield, & otherwise stock.
Science & OODA literate. ACA covered.