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Hesitation under 3k and rough idle is a sure sign of the pilot jets being clogged and needing cleaning.
If one plug is black, the float height may be out on that carb.
With these problems, I am not sure how you would get a good balance reading on the carbs and by adjusting the pilot on one carb, the balance is now out anyway.
As for needles, you can shim them or as many have done, install Thruxton needles.
FYI I have a set of Thruxton needles listed in the classified
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Bob

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