After I fixed the wrong cable, the noise coupling at higher frequency of the BF-damper in PRM was reduced as shown in the attached first figure.
Coherence at the frequency is decreased after fixing the wrong cabling. (Python script that I used to plot is in '/users/Miyo/dropbox/LOG/210211/')

I also compared the TFs among other Type-Bp suspensions in the second attached figure. In this figure, I confirmed that all Type-Bp suspensions roughly have the same TF each other but there is a difference among PRM and the other suspensions due to wrong calibration in klog#6949. So, we should calibrate so that the PRM have same TFs like other PR suspensions.