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I agree, bloom has alot of phosphorus in it, wich can cause problems with Calcium and other nutrien uptakes. Whats yout VPD? It looks like it‘s something environmental too. When the plant is in a stage of stress, try to reduce the amount of other stress you might put the plant under. If shes healthy, high light intensity is good to promote fast groth because (!) she can take it. But when shes havings some kind of problems, high ligh, dry air and hot temperatures (things to make the plant grow faster), cause even more problems much much faster. I mean, think about it. Maybe the plant needs Nitrogen for example. Your environment is telling the plant to grow fast but where is the nitrogen to do it (example)? It will get so much worse after only a few hours. If you reduce the temperature, highten the RH and lower the light intensity for a bit, you give your plant a little break to recover from what ever is causing the problem right now AND you also have think about a solution (flush ect.). Give it at least 10 hours of a low stress environment for good recovery. Also If you regularly spray the leaves, don‘t do it because it cools them down so photosynthesis goes down with it. The VPD depends mostly on leave temperature (example: how,wet towel in the sun vs. cold,wet towel in the sun)