This all seems very complicated and prone to error, and dependency (what if you want to take a weekend off?). It seems to me that you need a good, reliable method for breaking down NO3. I feed very heavily in my own tanks and also all of my customers tanks, but I use a
Slow Sand Trickle Filter to provide a home for anaerobic bacteria to consume the Nitrates.
As the water passes through from top to bottom, the aerobic bacteria strip the water of oxygen as they turn ammonia and nitrite into nitrate...then in the oxygen depleted zones further down, the bacteria survive on stripping Oxygen from NO3.
I know it seems like Im here to hawk my products...Im definitely not. Anyone can make these with literally anything as long as it doesnt allow oxygen to the anearobic zone.
But with something like this employed, all of the guess work goes out the window and you can feed as heavily as you like...whether it be solid foods for the fishies or planktonic foods for the corals, etc.
It works very very well and I highly recommend this to address your high nitrate issues.