Dan, something does not sound right, either in the connections or the phono stage itself.
The c2300 MC stage is quiet as it has a FET in front doing the first amplification, however my XONO was not noisy in the way you have detailed.
I am sure you have checked this, but I will ask.
Is the MM DIP switch off?
Try the single ended connection to see if there is any change to the noise.
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