I have in my notebook that at 9:49pm CARM was no longer using ALS as an error signal, and at 9:50pm, DARM was no longer using ALS as an error signal.  It looks like I was locked for 3+ minutes after getting to RF-only signals.

The increase in power near the end of the lock stretch was me trying to improve the dark port contrast by touching the ETMX alignment.  DARM was definitely oscillating as I improved the dark port contrast, so I was trying to hand-lower the gain as I worked on the alignment.