Indoors, outdoors ??? If indoors, how long on 12/12 ??? Indoors, if its more than 2-3 weeks without signs of flower... there might be a light leak. {I am on my first crop, so take grains of salt} I got a HUGE jump in new growth about a week after fixing a light leak, a week after that buds started to "build".
In your garden... a nieghbor with an obnoxious security light, or a street light has been known to screw things up.
As for hard core bloom, I did hit it with Beastie Bloom 0-50-30 or some ungodly numbers like that. But I wouldn't stray too far outside recomended dosage, even with low N stuff. Recommended dosing depending on product is probably ONCE for some, and maybe once per 2 weeks... definitely not twice per one week. 2 times in a week sounds like a brilliant way to Nute Burn in the P & K range. Anything is possible if you hammer it hard enough... and 0-50-30 is quite a hammer.