Also I am guessing you spread that out through the day not a bolus dose?It's more pronounced with smaller tanks actually. Larger tanks tend to be taller than smaller ones, but growth doesn't scale with tank height, more with lighting area. Good old square-cube law. So larger tanks tend to "waste" a lot more water volume on something other than coral. Especially if the larger tank affords a coral collector the luxury of having a negative spaces design rather than covering every last bit of area with coral.
At the peak of my tanks progression so far it was somewhere around 3.8dKH/day i think