I noticed that the ODC channel for the IMC was not happy. Tracked it down to some saturation in the WFS A and B inputs, presumable due to the input power increase.
I lowered the whitening gain lowered to 36dB (was 45dB).

I also readjusted some thresholds on the IMC ODC screen:
H1:IMC-ODC_DOF[1|2]_[PIT|YAW]_ERR_MAX 10000
H1:IMC-ODC_MC2_TRANS_SUM_MIN 2000
H1:IMC-ODC_IM4_TRANS_SUM_MIN 15000