Durban Poison Auto

Have done a fair amount of defoliation and LST through the week. Things seem to be going well other than some of the larger fan leaves on one of the plants has something going on (last 2 pics). Ran 2/3 of a gallon of RO water with CalMag through each to flush them. After some research I think the problem with the fan leaf tips is nutrient burn. As I understand it cannabis plants try to remove excess nutrients towards the tips of the leaves and since the symptoms are all for the most part towards the tips..... Made a new batch of nutrients as in the above recipe. This puts me at about 800ppm compared to my old recipe of 1100ppm. Going to run that for awhile and see if symptoms stop appearing/progressing. I used the GrowDoc app and ran several close up pictures of the damaged leaves and it kept diagnosing it as a PH fluctuation issue. I am using a quality PH-20 meter and have been checking my nutrient and run off ph. Nutrient: 5.8 to 6.0 Run off : 6.5 to 6.8 I also checked the PH against calibration solution and it was spot on. I like the idea of the app and it may get better over time but I would not use that as my only resource of diagnosing an issue. #Last Update After 3 days I do not see any new issues on the leave tips or the existing damaged ones getting worse.