The only reason I knew they like more calmag under the quantum boards is because I have run the same strain under my de gavita also. And it only showed signs of deficiency under the quantum boards until I bumped it up.
The area in the leaves between the veins will start to lighten up and turn almost white, and in bad cases look like this, which I believe is mag deficiency. It also had some rust spots around the edges which I think is calcium deficiency. This was my bridezilla, and heisen suggested bumping my calmag slightly and using no pk boosters until the last few weeks. I believe he said the extra k could also possibly be locking out calcium.
But for real bro, i'm a stoner with a shitty memory so keep that in mind lol
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And it depends how much my ppm is dropping, but typically if I notice it dropping, let's say 50 ppm, I would probably bump it up about 30 - 50 ppm and see what happens. If it drops again I'll bump it a bit more, if it raises i know that was too much and I'll drop it just slightly too find the sweet spot. Sometimes you'll find it and won't have to adjust shit for like a week cuz the ppm and ph will basically strike a balance and remain stable. But that depends greatly on environment too I believe, and how much your plants transpire.