Thank you for the schematics!
What I would certainly make differently: I would place a C in parallel to R6, because the voltage divider will propagate all noise from the +5V isolated rail directly into the signal. This would explain the noise at point B in your setup of 23.11. in this thread: Rev5 seed producing ~13dB higher noise floor - Electrosmith Products - Daisy Forums (electro-smith.com)
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