Final week! I gave it plain water only for weeks 11 and 12. Also gave it a full night in the dark the night before cutting it down, although I let it sit in the light for several hours before finally cutting down so it wasn't too humid.
In terms of trichrome colors to signal harvest-time, I decided to wait until I could just see amber ones emerge. I know some people wait until they see 50% amber / 50% cloudy, but I've read a few anecdotal reports of people having success with 100% cloudy with a few amber trichromes apparent. This occurred just before the start of week 13.