Frank, what form of sulfur were you going to top with? The way you said it, it was easy to picture pure yellow powder like from a chemistry set sprinkled around on the soil. That could have had you chasing more problems.
I'm glad to see Epsom Salt.
Sulphur Toxicity:
Leaf size will be reduced and overall growth will be stunted. Leaves yellowing or scorched at edges. Excess may cause early senescence.