So are you just relying on the sulphur in your Epsoms salt spritz. or are you also amending with elemental sulphur? And why on the subject would you please share you Epsoms salts concentrate recipe? Sorry Op, not trying to thread jack, just trying to help everyone with potency.
I was recently asked how I feed so I'll just copy that here ,,,,
I can tell you go slow, go light LOL I have tweaked it over the last 3 grows and feel I have it mostly dialed in and I am still playin with it in minor baby steps. When I first started I top dressed a plant with a tablespoon of Gypsum and let the watering drizzle it into the medium. Burnt the livin crap outta her, had to do a double flush to get her back. With that I realized my water had plenty of Cal so my adding of gypsum became 3 to 5 of the little pellets once a week NOTE: every thing I mix is to a gallon of water So if your water is good go light on the Calcium Sulfate !
With the 2 Jacks ferts I do 1/2 teaspoon of Citrus mixed with 1/4 teaspoon of Aquagold and an 1/8 teaspoon Epsom for veg I reverse this in the first 4 weeks of flower doing 1/2 teaspoon of Aquagold with 1/4 teaspoon of Citrus and the 1/8 th of Epsom
In week 5 I do 1/4 teaspoon of Aquagold mixed with 1/4 teaspoon of Potassium Sulfate and the 1/8th of Epsom
In week 6 I do 1/4 teaspoon of Potassium Sulfate and 1/4 teaspoon of Epsom
After this and to the end I rotate the 3 I just explained for flower and depending on how they look (green wise) I might give em a dose of the veg proportions once, in the latter weeks.
I do not feed every time I water, there are times they just get water but I make sure they get fed at least twice a week and I don't follow any kind of schedule I base what they get on how they look and only deviate from the mixes I have explained if there is a problem. As example I just had one show a mag def and hit her with 1/4 teaspoon of Epsom to a quart of water, she is now startin to come out of it (I have noticed some strains like more Mag)
Also if a strain shows they don't like the menu being fed to all, I do adjust it just for her but this is rare in most grows so far
I should also note that I have never owned a PPM or EC meter so to those numbers I have no clue, I have always based what I do on plant response. After watchin em for as long as I have I have gotten pretty good at it.