Dosing more Ca than Alk? Is this okay?

[LeanneP]

I have been using your C-balance for a few years for my 90 gallon mixed reef that is about 5 years old. In the last 6 months or so I have been fighting to keep my calcium above 370. My alk is around 8.7. I am using kalk to keep my ph up and have also started dosing mg again. I decided to start dosing more calcium and it is now at 400 and my alk is still about 8.7. I am dosing almost double calcium to alkalinity. I know that I am supposed to dose equal parts so I am just wondering if this is going to throw my tank off? I don't have any precipitation on my pumps so I think that my tank is just using a lot more calcium. Is this possible?