Yes, my controller runs the dosing pump (brs 1.1 mil per minute) five times during the day cycle, two hours apart for 15 minutes per cycle. I'm testing the water to see how that does, and if it's too much or not enough, I'll make whatever change I need. I am sure that eventually, I'll need to just dose all of the top-off water as kalk, but until then, this is me wading out into the kalkwasser.The pH swing of 7.9 to 8.2 does not concern me much. Mine can swing that much, too. Although I have a lot of chaetomorpha in my refugium, my pH is usually lower in the morning. It's back up to something like 8.2 in the late afternoon.
A dosing pump should help to keep the alkalinity stable. Are you using a controller for dosing as well?