Hilfe!!!

you don't have symptoms of either Caclium or Magnesium. If you flattened out all the ripples in the leaves and looked at it with your eye in normal lighting, i don't think you'll see interveinal chlorosis - even so, without spots accompanying it, it isn't visibly identifiably as a mg-deficiency. Ripples in leaves with intense light can give an illusion of inconsistent pigmentation. Darker in valleys and lighter at top of ripple makes it look like interveinal chlorosis but that is not always the case.. In third picture looks like any paling is occuring inside-out (from petiole out vs tip-in). This is possibly a S-deficiency. Look for a corky surface to trunk at bottom to help verify. Or, if any red/purple streaks in the trunk is another S-deficiency symptom -- ** not purple leaf stams (petioles)... the trunk of the plant and branches only. If soilless, calculate some ppms and compare... one note, if an aspect of your formual is greatly different, this information is less likely useful, but still may be. the interrelationship of the elements involved and how they stimulate or antagonize each other makes for more than one formula that can work decently. N 120-130 (drop to 90-100 by 3rd week of flower) P 40-60 (this one can go higher without issues, but also just wasting it down the drain) K 180ish Ca 100+ Mg 75-80 S 100+ This is not a formula for soil, because you are supplementing existing nutrients in the soil. This is only for soilless/hydro setups. The more heavily you are supplementing the soil, the more it correlates, because that means you've nearly exhausted the nutrient content of the soil and relying more on fertilization than before. This makes it a bit closer to soilless/hydro context. Even if you built the soil yourself and years of experience with it, there's still unknowns in this regard, so take this merely as one more thing to consider before choosing a path.

Excessive nitrogen and not enugh magnesium. Not a calcium issue.

I don't see any signs of Calcium issues. Maybe some Mg, but could be a few other things. https://420life.com/wp-content/uploads/2021/10/Marijuana-Leaf-Deficiency-Chart-scaled.jpg here's a leaf chart to help you troubleshot this. Also if you know you are feeding a good amount of Mg then its not likely it. and might be more PH and avilablity.