I don't even think it's heat stress brother, I think it's just magnesium def from bloom - if you stop it soon enough it won't keep going. Can you call the pharmacy first and ask so you don't waste time? I'd use 1 tablespoon per gallon, every other or every two waterings. Molasses I'd use 1 TBSP per gallon when you're not feeding the Epsom Salts or once every two waterings like the Epsom - it's more about how the plants respond, start off slow, move up, stop as you work your way up to a desired level. Some plants require more mag than others. Some plants thrive better with the mycos being fed the epsom and the added magnesium and iron are beneficial.