Are you using the full test or just the big three.yes i use the red sea test kit. I might try decreasing the intensity then.
Defiantly look into Dutch synthetic reefing if your going WC free and look up farmerty.
In no WC methods your supplementing All of the elements found in mixed seawater past the big three.
Fwiw once I greened a few acros recently it took three weeks to get them close to normal.