i would replace the epsom salt and lime with dolomite
dolomite is sometime referred to as lime, though they're no always the same, dolomite is real cheap and readily available
dolomite has plenty of magnesium(and calcium) which is what epsom salts are often included for
and dolomite's effect on ph is excellent, if you use dolomite, you probably won't have a ph problem(using water in the 6-7 range)
i know that epsom salt is pretty popular, and i can't dispute its usefulness as a magnesium source
but one seemingly knowledgeable grower cautioned against it, claims it is often the source of harsh smoking bud