The shape of the machining path appears to be consistent with about 0.01” of bit deflection. If I found the right bit, and did the math correctly, you have a chip load of 0.00125”. I have no experience machining brass on a Onefinity, but that seems fairly high for a bit with a tip radius of only 0.010”. You might try cutting the feed rate in half, and see if that gives better results.
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