It seems that there is high coherence between ASC CSOFT/CHARD and LSC PRCL/MCL. Please see the attached plots (data from Jun 20, 02:00:00 UTC, for 1024s).

Especially with PRCL, the ~0.4 Hz peak seems to be related to the dP/dtheta instability (37046 and alogs referred therein). Does this indicate that there is a large cross-coupling from LSC to ASC ( i.e. a large dtheta/dF term in the dP/dtheta loop)? Would l2a ff (see, e.g., LLO 31756) help?