That is a lot of alk and calcium to be adding and still have those readings. I wonder if the timing of the dosing has anything to do with it?? How much time between dosing each different additive?? Maybe it would be better to not dose each hour, but rather for a longer duration on the dosing pump over less increments (lets say 6 times per day verses 24 times per day, if i read your post right, that is).
I have read that dosing alk and calcium to close together can cancel each other out. Maybe dose Alk in the am and calcium in the pm?? Just throwing out ideas for you.