Sounds like the spray you used might have shocked them. What about trich development ? Are the girls showing any frost ?
Where you're at can also affect when your girls start and finish. When this big round ball we're riding tilts, angles and amounts of sunlight hitting our plants does also. I've planted in spots outdoors before, that weren't so great, and plants ended up getting more exposure later in the year, than during the summer. Like real estate, location, location, location. Lesson learned.
Indoors we can force the 12/12, outdoors plants tend to start flowering once the daylight hours drop to 13.5 or less. Here is a link to a daylight calculator. The National Weather Service has the GPS coordinates on their weather for your area page, or you can just google the gps coordinates for a town near you.
http://astro.unl.edu/classaction/animations/coordsmotion/daylighthoursexplorer.html
I'd water them with plain water, then feed them a dilute seaweed extract a few days later. It's always good for dailing shocked plants back in, that, or Super Plant Toinc by BMO.
It's also good to stop feeding your girls any Nitrogen for a week or two, to help them transistion to flowering. Then resume feeding some (like as little as possible, just enough to keep them green until that last few weeks).
