SuperThrive really isn't a fertilizer. Yes, it does have some components that provide some minimal nutritional value, but it is really intended to be a source of synthetic root growth-stimulating hormones. You'd really be better off using a decent, complete fertilizer, at a low dose. (If you feed about every two weeks, I'd recommend about 100 ppm N - just divide 8 by the %N on the label, and the result is the teaspoons per gallon to mix.)

According to a study done by Dr. Y-T Wang while he was at Texas A&M, it is NOT a day/night drop that induces flower spike initiation, it is a couple of weeks of a consistent 10°-15°F reduction in the AVERAGE growing temperature that does it. I tracked the temperature for an entire year to test that, and have written up (and graphed) the results at my website.

Of the full 365 days of temperature tracking, 222 of them displayed day/night temperature variation of 15° or more - and they occurred in every month of the year, but I only saw 2 continuous weeks of reduction in the fall, and sure enough, spikes started a few weeks later.