thats because FFOF is hot
needs to be mixed with something else like light warrior or a media that has excellent drainage without a nutrient charge. that mix will keep you good for a month. plants will tell you when they need more fertz. then start feeding at 1/2 strength and work up.
dude epsom salts work weel in a foliar treatment but only really for mag, not the cal. Calcium is immoble and has to be taken in from the roots. It takes a while to restore the plants new growth to a clean apperance and rid the cal deficiencie. Chances are that you had enough cal, it was a PH imbalance that threw your plants into a deficiencie. And excess mg is not good either, especcially foliar fed because of its almost immediate availability.