Very strange that you find yourself falling lean on top with both the n13 and nED range as they both have a rich 3rd taper that would usually require a smaller main. The n3 range has a lean mid/top end.
I have found the needle straight diameter to have a pretty big influence over the burble just off idle. If I leaned out the pilot enough to clean up the off idle stutter I'd get a racing idle and some hard starting.
NEDJ the next leanest on the straight diameter, or NECx needles are available as half clips.
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