you posted "carb has an e-clip and two washers per needle"
This indicates the presence of a jet kit (brand?) so ....some tuning is required.
If you could ID the brand of jet kit, it would be helpful. The brand and size of the main jet may offer a clue to the jet kit. Factory Pro, Dynojet are the most popular.
Personally, I use a specialized custom spacer above jet kit needles, thus preventing needle "float" which is often present without them.
A close up pic of your main jet may provide a clue.
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