Home Depot and similar sell a cheap soil pH meter, for about 15 bucks, that will be close enough for government work. Get that and put in moist soil, wait for a min. 5.3 is pretty fooking low. You might get some Lilly Soil Sweet while you're at it, cuz your pH is probably pretty low, and that's the fix. If the soil pH is out of range, you'll get lockout, and that could easily be the cause of the mottling above. This is the meter. Yeah, it's cheezy, but they work for me.
https://www.amazon.com/Moisture-Gar...+checker+soil&qid=1555093391&s=gateway&sr=8-1
Feeding ever three days is fairly intense. I feed once a week. You didn't list details about how much you are using per gallon. Mixing random shit in like you are doing is a recipe for "What's wrong with my plant" posts. I would get a known solid fertilizer, and use -just- that, at half to 2/3 recommended strength. I suggest
Botanicare Gro and Bloom. If you must add something, add a -small- amount of a micro-nutrient mix, like GH Trio micro.
Botanicare contains
cal-mag, so no need for that.
Hydrogaurd is useless in soil, you can stop that. It doesn't hurt, but it's for maintaining healthy hydro tanks. Molasses is a placebo, so can ignore that. I have no idea what insect frass is, haven't needed it in 40 years of growing, suggest you eliminate that.
Simplify and reduce feeding, and figure out the soil pH. We'll work from there.