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Change C28, C29 to 1uF #4
Changing ADC level changes input impedance to a value as low as 20 k ohms. With 0.1 uF value as shown in the BOM, the high-pass cut-off is:
A change to 1 uF will have the following effect:
The proposed DSP high-pass (DC removal) filter is also designed for 8 Hz cut-off, which yields another -638 mdB for a combined response of -1.28 dB at 20 Hz and -55mdB at 100 Hz (99%).
TLV320AIC3104 datasheet page 36: