We fine-tuned the LSC SRCL input matrix again today by driving PRCL length at 32Hz and 135Hz, and minimizing the lines from the SRCL error signal: 

POP_A_RF9_I ---> SRCL was 0.038 and was set to 0.024

This reduced  the PRCL to SRCL coupling by a factor of 14 to 30 initially, cleaning up the SRCL error signal nicely. However, we noticed that in the next lock the coupling again came up some, to a net reduction of about a factor of 5.
We added this settings to lscparams.py.