ok a couple of things, dont raise your alk by more than 1 dkh a day in my experience. so change your end values that you want to raise alk to a value of 7.1. Im sure you can raise it by more, but i have found that my coral react and are stressed if i do. Ad the amount slowly over the course of the day.
For CA, i have never seen any issues by raising it quickly. i would still dose over the course of the day.
I always dump my Alk (Part B) where my return pump is so i know it gets mixed in really well. I dump my CA in the overflow before the sump so that it is mixed before hitting the pump. I have found that this reduces the amount of precipitate i get on the warm electronics like heaters and the pump itself.
what salt are you using? My IORC mixes at a high alk. I don't really do water changes anymore, about 10 gallons a month on my 360 total gallon system max.