I have no experience of these top dressing products like Gaia Green. I generally use a single bottle feed. I tend to suffer from Ca and Mg deficiency. To stop this I took to adding a teaspoon of Epsom Salt and Calcium Chloride per 5L of water, every other feed. I don't get the deficiency anymore.
The reason I don't like the top dressing feeds is because once you have added it, you can't take it out again, you lose the control. You leaves look very dark and shiny, this says to me that you have a lot of Nitrogen. 4-4-4 + 2-8-4 = 6-12-8, then you have added Calmag which is 1-0-0, so even more Nitrogen. From what I have been led to believe, too much Nitrogen can block the plant's uptake of Calcium and Magnesium.
I have a friend that is a Chemist, he teaches Chemistry at a school in Sweden. He finds the very idea of pre-made Calmag products hilarious, because you are paying for mostly water. Which is why I use Epsom Salt and Calcium Chloride, for the price of a bottle of CalMag I can buy enough to last several years. He also finds the idea of mixing fertiliser with RO water funny too, basically you are burning a lot of energy to remove everything to make pure H20 and then adding it all back in again.
So, to sum up, I think you have over fed and because of it you are blocking the Ca and Mg. I might be wrong, just my opinion.
Have you been watching Mr. Canuck?