Pull the mag cover (left side of engine) and try to move crank up & down. If you detect any play at all, the left side crank bearing is going bad and causing the crank seal to leak. this'll cause a lean condition at idle & just off idle.
My '01 XC 200 ran like yours when i bought it. I went a step larger on the pilot jet and it ran much better. Until the left side crank bearing finished going bad.
Not saying you've got that problem, but it's worth checking out.
RB
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