Sounds to me like you need to slow down and try to stop controlling every aspect of everything. Hands out and let everything balance out. Then you can take it one step at a time. It will be ugly for a bit but will be a masterpiece in the long run.
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I personally use kalkwasser in my ATO reservoir and hand dose alkalinity when needed with sodium bicarbonate. Each system is different, but I've never had precipitation causing "concrete" sand.
I did have precipitation using sodium carbonate a couple years ago. It covered everything in my sump, pumps just like concrete. Never again would I use baked baking soda!
Uh oh. I just made up a gallon of baked baking soda. Guess I’ll do some more research.

