Early flower buds are burnt looking

First ever outdoor grow. Everyrhing was going great then BLIGHT(leaf spetoria) set in. Been fighti g that got it kinda under control but now new buds look burned leaf tips growing crooked.
GH Floraseries kit w/cal mag
6.5 PhD water
35 gallon air grow pot 0822211039.jpg
 

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There's fungus pants but no other bugs. Even got my jewlers loop disnt see any. Spraying yes baking soda water an a little peroxide for the leaf septoria stopped spraying that a few days ago.
 
This looks really 'off', why are the pistils dead, it looks to be in very early flower?
I'm a proponent of the 'last thing I did' method. So:
1) Were the flower heads like that BEFORE you sprayed? Because if it was septoria, then septoria doesn't cause that.
2) If the answer is 'no', then I suspect your spray caused that. How much dripped into the medium? What is the pH of the medium now?
 
ppm going in is 800-1050 coming out was like 2200. 6.8 oh foing in 5.9-6.2 out.I got to looking at the bottom of the airpot and alot of roots grew through the seam of the bag. So im not sure if I got salt build up in the bag or if the roots sucking up the drain through on the ground. It's about 6inchs off the ground.
 
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