How am I doing 1st flower under led 3rd grow ever

Hey Mr grow it should I use veg nutes my first week of flower instead of flower nutes or did I just underfeed ? my ppm 3 days ago on the og kush that's yellowing out at week 5 was at 1200ppm after dumping a feed of 950 in til runoff so guessing it had hardly anything to eat and no nitrogen same with the back one it started to fade early and ppm was like 1225 after same 950ppm nute feed the dark green one was at 1225 to but that day it got a watering with calmag only til runoff no feed so think I starved other 2 a little or needed more Nitro .....should I check ph if good keep feeding for extra week? Or is there no more fatten dense up these nuggets like they should be? Chalk that one up let it fade trics are still clear cloudy on all maybe some light stress playing around with the new led lights

@Josh Wilson Some growers do that. PPM of 1200 should be fine for early flowering. You may have a nutrient imbalance; excess of some nutrients can lock out others. I'd like to know the runoff pH value for the problem plant.