First I will say. . . corals look to be doing great with your current system!!! haha
But if you are shooting for higher nutrient levels, sure you could keep upping the dose until you find the sweet spot where input is matching your export. . . though I would probably shoot for dosing multiple times a day rather than increasing a single dose.
That said, could also reduce nutrient export, i.e. change mechanical filtration (filter socks) less often, dryer skimmate, less hours of refugium light. . . obviously this depends on what kind of filtration you are currently running.
