Okay guys let her rip

Tell me where I dropped the ball on this Grizzly Crinkle (D90). It looked fine a month ago, the last picture was on Jan 26. I’ve been running sensi grow+bloom a+b for the whole run. I used canna rhizotonic, and I will say there was a bunch of mornings I came out after mixing reservoir the night before and the ph went from 5.5 to 6.7 overnight. I use RO water, drip clean, etc. The plant grew really close to the light after stretch and stayed for about a week before I could raise it, is it all light burn? Old calmag deficiency?