Whooaa whoaaaa.. Your tap water alone was 800ppm? That's probably your issue. I wouldn't even drink water with that high of a ppm.. You'll want to find out why it's hat high.. Is it due to calcium or magnesium or chlorine or something else.. A local water report will give you that info.. But I would switch to distilled or RO water.This is why growing takes years to master, and I'm not even a novice yet
I don't have a ppm meter handy any more I'm afraid. Last time I checked the tap water ppm it was up around 790/800PPM. I remember it being very high with a pH of over 8.
I shall carry on feeding with just phd water for now and see if that helps. I might have used too much dry amendment. In which case I'm laying off all bottled nutes for the mean time.
You are correct... Growing is a forever learning experience. Every plant, every grow is different.