Hey man thanx for the reply
I thought so I was a little skeptical of whether it was P or not cause Im used to purple showing up as well and I have NEVER had low N (Except the one time where my PH was 4 lol) lol I go the other route to often haha....Hmmm I have had issues with both these for a bit now but when I add more N my leaves go dark or even claw a bit....hmmmmm Oh and Yes I am using a pk booster its big bug by AN and I will be using over drive when switched for late bloom Big bug is 0-4-4 and over drive is 1-5-4. Hmmmmm curiouser and curiouser. I have even up to the point where I burned the girls just a tad bit then backed off some to try and correct and it would....but only for a few days at a time AKA slowed it...Ehter way its not agressive and doesn't seemingly having a huge effect that I know of. So meh lol
My pleasure brudda Clix! .... N I'm much less concerned about than P,... With AN, Nitrogen gets snuck in from Ca-Mg and other sources, so keep a fish-eye on that if you're finding touchy responses like that,... I think with coco, like hydro, you live on the edge all the time! 
As you see, you can burn one week, starve her the next,..
-- it all happens faster than in true soil,... I wonder, even with synthetics, if that excellent Mammoth P product would be a stabilizing factor for you in coco,.. You know of this stuff? it's an inoculant that has specialized bacteria geared toward P availability and cycling, not the usual suspects in other typical inoculants,... In any case, you've found kinda where the edge is, so maybe on occasion add a little extra and see how she takes it,.. maybe switch over the Overdrive, for the extra dash on N,...
... I think you can ask the company for a free sample still..? :smoking:
I will have to check that out again maybe add it to my slury of products lol
