The attached plots shows the power readbacks of the HPO:

• PWR_HPL_DC (after HPO): Looks reasonable for most of the frequency range. ADC limited >5kHz.
• OSC_PD_INT_DC (internal): Looks reasonable for frequencies below 1kHz. ADC limited >1kHz.
• OSC_PD_ISO (small, wrong polarization): Not useful above 50Hz.
• OSC_PD_BP (don't know what it measures): isn't ADC limited.
• OSC_PD_AMP (after 35W amp): On the one hand, at low frequencies the RIN is below the HPO readbacks as expected; on the other hand, it isn't between 1 kHz and 4kHz. Looks contaminated.
• OSC_PD_*_AC: nothing useful, not even correlated to corresponding DC channels.

The RIN calibration was obtained by dividing by the corresponding DC value.