I am a total newbie, but I have been dealing with a similar problem, and thought it might help you. I recently started dosing the b-ionic, and right from the start, my KH shot up to like 13. so I stopped using the first part and continued adding calcium hoping it will drop. Several days later, no drop, so stopped dosing all together. Today I went in and did a full range of tests at LFS including magnesium. My calcium had rapidly dropped in the 2 days that I had stopped dosing to 380, KH stayed at 13, PH 8.3, but my magnesium was at 940 when it should be around 1300(mg/l?). So I know I am having the opposite of your problem, but it seems magnesium is effecting my KH drastically. (If you have a lot of coralline growth I would check this) Also I hear strontium may also be effecting KH levels. Hope this can help.