salinity issue

[spawn]

Over the last 5-6 weeks the sal. level in my tank has started to climb on a weekly basis from .026-.028 by weeks end. I think it is due to the amounts of Ca which is dosed at 253ml per day & the Alk which is dosed at 184 ml per day into 55gal GWV. The thing of it is My Ca levels have been on decline for at least the same time period maintaining only 360-380 alk is quite steady @ 7.6-7.8. With dosing these amounts, I'm positive the dosing amounts are exceeding the top off amount causing the increase in the level of sal. Does anyone have any suggestions on what to do about this?