Dear David, It doesn't seem unusual to me that you would get 4 or 5 cents discrepancy way out at the 10th partial. I would be interesting to know if the notes surrounding G2 also measure this way. What does seem a little odd is that such a high partial would create an audibly offensive beat. My guess is that there is a hard spot in the hammer under, or close to, the string grooves. You might listen to each string individually, trying to hear this partial. A little shallow needling in or along side the offending strings' grooves may at least reduce the beat's loudness. Any hard, crunchy spots (laquer) you find can be well broken up with a few well placed stabs. As has already been mentioned, seating strings to the bridge, completing the string bends at the terminations, leveling strings and fitting the hammer to the strings may help. I like to complete the bend at the bridge by placing a tool (brass) perpendicular to the string about 1/4 inch out from the bridge pin. Holding the tool down low, almost parallel to the string plane, a light tap from a rubber hammer will straighten the gentle arc of the string into a straight line. Size 21 wire is pretty stiff and may benefit from this. David, please let us all know what helped or didn't. Thanks.
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