Fan leaves developing brown crispy spots?

Quick info:
FFOF soil
Technaflora RFS kit (running full strength, feed-water-water)
PH'ing to ~6.5
Temps ~ 85F, humidity is in the 30's
200w 10,000lumen 2700k CFL under an adjustable hood about 4-8" from the canopy

First 2 plants, unknown bagseed, likely Mexi Sativa.

This plant is about wk 6 of flower, as last time I harvested at week 8, and was starting to develop similar signs, so i figured i'd see if i could find out why, maybe i can let her go to 9 weeks this time and finish her off right, I've got another like her with like 8 colas instead of 3, and she's in very early stages of the similar looking symptoms:




and this one is like wk 3 of flower(Berry Bomb). She's ony showing very light signs of this:

so i ph'd the runoff its about 6.5 as well. i remember with the sativa the runoff was like 160-200ppm from the second water before refeeding, am i maybe leaching too much? half a pot per water. the starting ppm is 1600

and the indica was 900 after first water so i leached it down to 700, i dont think that one is using too much nutes compared to the sativas which appear to bu gulping them

Crispy? Hmmmmm.......relate to life.....if you put bread in the toaster, when it gets too hot it gets "crispy", then burns......Nutes do the same thing to your buds. IMO, over half the folks growing overnute.

Moi included..............

Im just throwin out calcium def.

Looks like calcium deficiency to me.

maybe im not measuring the magical properly. i use the water refil stations that filter the water like 3 times and use uv twice so its prob cleaner than ro but not quite distilled. should i add magical to my plain water maybe? or just maybe go double strength on the feed for magical?

I have the feeling it's nute burn also. Just had my WW have similar sign on one of it's bottom fan leaves, flushed and checked my run off ( I'm a hydrow man ) the ppm was almost 220ppm over my limit.