Just a couple things I noticed...

I use humic acid once a month as an additive. I tried using it weekly, but plants stunted and root growth was greatly accelerated, (rootbound issues started showing) so I use it only after my monthly flush.

Potassium sulfate (Meta-K) can build-up and can potentially alter (raise) ph if overdone. What hapepns if you don't use the Meta-K?

At what point do the leaves start falling off? Early growth phase, late growth phase, at the start of flowering...?

Do you flush...? If so, how often and how much?

What do the roots smell like?

Are your nutrients over a year old?

Dirt? Dirt is what you clean from under your fingernails. I'm guessing you meant soil...? (you're not using ANY dirt from your fields, are you) :wtf:

If it is a disease, cloning won't help. I would strip my additives, and go with the basics only.
Why the two different nutrients manufacturers? Try just one, as they may be interracting negatively with each other. At least this way, you can see if maybe it's something you're adding. But if it hasn't been affecting other plants and strains, doubtful that's it.

During the winter, I feed set ammounts (quantities) weekly, and water to slight runoff inbetween if necessary. That way I can look at the plant(s) on the next feeding day, and know how much or how little of the nutrient mix to add that week.