IMO float level is very picky on these. Have you checked it? It might help some. Adjust it to the bottom of the sight hole, were it only has fuel come out if you rock the fender. Then turn it another 1/2 turn down.
I didn't read through all the posts so if these have been mentioned pay no attention.

also sounds like its idling on the primary/intermediate circuit. Back all the idle speed screw out all the way, turn the back idle speed screw in after it touches the cam 3/4 turn, now adjust the front to get proper idle.