New grower here so apologies if my questions dont lead to a solution for you. But I am sure they will have some bearing when others like @Covertgrower @Dbpooper @Hellraiser @Zee and some others show up.
So 7.5 ml of cal is a pretty good amount. I add 3-5ml per gallon to my ro water which is 10ppmish and it brings my ppm up to 3-400 just from the cal. If you are starting with with 225pm city water and adding that much cal that will definitely add to your total ppm numbers. I was also wondering why you top dressed the ocean forest at day 28? What were your runoff numbers to make you want to add nutrients to ocean forest so early?
Ph problems at the root level can cause lock out of certain nutrients such as calcium. The problem will only get worse and you will keep adding cal-mag waiting for a result. I am sure you already know this .
Also have you gone to your city website and looked for a water test result? It is usually easy to find. that will tell you how much ppm of cal is already in your water. you may not need to add any.
I will say that that high of ppm I was told is in the area where you might want to think of using some Ro… Thats just what I was told, as once again I am a first time grower. I am sure the experts here can help get you sorted.
Your plants look pretty good to me as a whole. I am sure you’ll get set on the right path here.