I was just looking in the infirmary. I think you might right about P. I've given very little in the form of nutes. 1/8 strength at 21 days, 1/4 strength at 28 days and again at 30days. And I have a little under 1/2 strength mixed for my watering for day 36. I give calmag on all the waters in between. I started at 1/4 strength and worked my way up to full strength. I gave a full strength dose at day 32 and 34. Im wondering if im underfeeding. I think the first thing I'll do is check my soil ph. If it's on I'll assume theyre deficient in P? Or possibly N locking out P?I know theres some clawing on a few but I was leaning towards wind burn as its only on the ones that are getting the most fan.