Why don't you have your kalk set to dose 24/7 with the program set to keep your kalk between 8.3 and 8.4 (just an example), and cut out two part all together? If your dosing doesn't keep up with Ca and Alk demands add vinegar. If your sump doesn't evaporate enough add fans. etc...etc...?
Dosing at night is keeping up with my evap demands. I'm trying the vinegar now, if that isn't enough, then I'll add a fan to evap more. Still getting it dialed in.
