Tare out any environmental changes which would change water/nute uptake ratios to be sure- ie, drop in humidity will lead to water/n ratio increase- but it sounds like you're there.

Cut way back for a day or two and watch yer #'s- if you don't see an EC plummet, then yer good to go.

Finish times distribute over a Bell curve- you could easily have one that's done. Keep an eye on it for a couple days and watch for a second wave of calyx development before you call it done.

Yer watching your numbers- that's hot.