i have been decreasing the nitrogen, starting to t...

I'm not seeing any info on what nutes you're giving them and how much... But yeah, I normally cut out the grow nutes (I use Fox Farm) by the second week of flower (having decreased it initially when it goes into flower)... I rely on two different bloom nutes, one of which has a small amount of nitrogen in it as they still DO need SOME nitrogen... but too much nitrogen will lockout calcium which flowering plants need... and if you get into a situation where you have a calcium deficiency, just adding calmag will not solve the problem if the nitrogen is locking it out.. Good luck!