Despite turning off all violin mode damping in full lock, some of the fundamental modes appear to not ring down over long locks.

There is a very slight drive to the PUM coils from the ASC signals, which I have now notched out at 500 Hz (using FM5 in the SUS-[E|I]TM[X|Y]-L2-LOCK_[P|Y] filter modules). It's not clear that this drive is the culprit, however.