92.375% of the time strain isn't as important as the phenotype. (some numbers fudged to simulate actual knowledge) But yup...that could be included. Along with growers experience level, whether it's their first crop, quality of the genetics (bagseed or seed botique) brand of medium...

For the most part, I treat all my indica doms the same, and since my sativa doms are more sensitive to nutes in flower than the indica's, they are handled a tad different. But not all that different...just less nutes in flower, and a longer flowering cycle.

Have you tried eliminating all non-essentials, and see if there is any improvement? (anything other than the nutrients) If you had success for the past ten years, (with cannabis, right?) what has changed, and why? What have you stopped using, or what did you start using, what isn't available any more, so a substitute is now used...? Are you mixing mediums mid-crop?

Still, my intuition tells me it's likely the micro's and metals in the molasses, the kelp, the Liquid Karma and the fish goop. Were I you, I'd look up the ingredients of those products, and see what you are really adding to your regimin.
Fish goop...hmmmm. Possible mercury poisoning, lol? (or did you break a CFL bulb in the growroom?)