Shim(s) (or clip position) correct a lean point just under 1/2 throttle. See the chart in the Section II of the linky. A need for needle shims might be indicated by a slight hesitation (miss) at 1/2 throttle, whether you are accellerating or not. This is a different hesitation than you'd see at cruise.
Generally, cruise hesitation is caused by pilot jets that are too small.
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