I think we have had this problem before - in the old giant thread. But I don't remember what we did to fix it.
If GR meter indication changes (and stays changed) when ratio is changed, but with no input signal, then either the diodes or c19/c20 - the two DC-blocking capacitors in the sidechain rectifier - must be leaking.
Or maybe your meter-FET is much more sensitive than your audio-fet, and thus indicates too much change.
Try letting a sub-threshold signal through (some 25mV or so) and check if the signal level is also affected by the ratio switch.
Also check how DC-levels( signal and no-signal, different ratios) behave at point7 , where your control voltage can be read out.
Jakob E.