My first thought is a sticking slide or pin hole in the diaphragm, but others with more time on this carb can advise better.
Knowing When the problem started could lend some clues.
I can't pinpoint exactly when it happened, but here are some things that happened AROUND
the time I started noticing it:
Dumped the bike into a foot of mud water during offroad
Switched to full synthetic oil (this completely solved my oil consumption issue and also made shifting a bit better)
Had an issue with my gas boiling (vaccuum in the tank, probably clogged fuel cap from mud water. Since then I have a different gas tank)
Put new tires on and had them trued
Ran really low on oil at one point without noticing, probably had like 1/2 quart of oil running in the bike at some point
spent time abusing the clutch learning to wheelie in parking lots (I stopped doing that after dumping the clutch in first gear shot the front wheel up to 2 o clock)
so yeah, take your pick on what could have possibly done something