I experience a similar thing.
I know that my needle (N3CJ) is a clip on the rich side but I like it running a little "fat" in that area. I use big throttle openings down low and either get into the initial part of the power band or right into it often. This keeps the motor running pretty clean and doesn't "load up". It always idles fine.
However, when friends of mine ride it the power band scares them a fair bit (pussies) so they tend to lug the motor with small throttle openings and thus load up the motor. This eventually causes a low idle situation or it is so loaded up it just stalls. If it was their bike I would lean up the needle to keep the motor running cleaner and maybe bring the AS out a 1/4 to 1/2 turn and adjust idle screw accordingly.
Does any of that make sense or help ?
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