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.

GL