The pilot jet handles the first 25% of throttle, so if you've adjusted the needle to make it leaner (which is more of the mid-range of throttle), maybe try swapping that out with a different size.
And again if anyone else can contribute to clarify, I'm going off my limited knowledge of the one time I did carb adjustments.
This video is by far the best I've seen, and explains exactly which jet does what. A bit long but might lend some insight.
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