If you thought you had problems keeping parameters stable think twice before using kalk which is hard to use and dose.
Its a 34g so its not that big. I would dose seachem reef builder and seachem advantage calcium, everyday I would first dose reef builder, wait an hour and then dose advantage calcium, everyday, you would still have swings because your consumption seems big, but say you keep your calcium at 480 and the next day the swing gets it to 450, and alk at 12dkh and the swing gets it to 10dkh then that wouldnt be that hurtful because you would still be in a good range as oppossed to the 400 and 6.4 low ranges you are right now.
Oh and by adding magnesium you will notice how easier is to keep both calcium and alk from pushing down each other.
A note on liquid supplements: I bought kent marine part a part b, in gallon bottles, and they look big and stuff, but then you begin adding a lot of the liquid and realize you need to use a lot in order to raise a parameter, and then I get the same result with say 2 spoons of powder form, so for me it wasnt worth it investing on liquid, again. Perhaps thats the problem you´re having, that you think you´re adding enough when in reality the concentration of the ESV liquid product is to low and thus cant really boost a high level range.
So basically I would dose both supplements daily, the ammount will be determined by you. If you have the money you can get dosing pumps, however they still need to be calibrated, and liquid supplements are not moneywise as I told you, you could go with powder dissolved in water but I dont know how much you would end up spending in dosing pumps.
