Something doesn't add up. Dave, your LTR needle measured 2.66mm on the straight dia.? That would make it richer than the CCK (K=2.695mm). If you were lean off idle with the LTR needle I would think that the CCK would make things worse all else being equal.
300s are tougher to get perfect plus I think you tend to ride them at lower throttle openings, making those adjustments more critical.
What effect does your ignition map switch have on this? Did you jet for one position or the other?
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