I used Black Gold one cycle back and it took me two full months to recover because I fertilized as usual. My normal strength ferts burned the heck out of the plants and stunted a few bad also.
Try using half strength or at least keep it on the light side. I had to flush them and go down to 25% of what my chart said to fix my situation.
Black gold may be a great potting soil stand alone but I am going back to my old organic potting soil.
"Prohibition...goes beyond the bounds of reason in that it attempts to
control a man's appetite by legislation and makes a crime out of things
that are not crimes. A prohibition law strikes a blow at the very
principles upon which our government was founded."
-- Abraham Lincoln, December, 1840