Lately I've tried to run nutrients a little lower...i started realizing that less if often more. But for my bloom nutes on my photoperiod I usually try giving them a light dose prior to the flip. But...when I do my outdoor grows i don't bloom them until i see pistils show up like you. My veg and flowering period is so long here that I kinda have to go off what mother nature guides, it's not like flipping a switch. I just had summer solstice and so our days are getting shorter everyday..but that could still take weeks to reach anywhere near a 12 hour darkness. So with yours being outdoor I'd stick with the pistil guide.👍