After about a 5.5hr lock, noticed range slowly drifting down over several hours.  With H1 out of Observing, took the opportunity to touch up the Squeezer with:

1. OPO Temperature Adjustment (see 1st image), followed by...
2. running a SCAN_SQZANG_FDS (ran one of these at the t=1hr mark for this current lock); see 2nd image.