Are your other numbers pre or post pH adjustment? If they are pre-adjustment, your water was in a slightly-scaling condition. If they are post-adjustment, your water is balanced. Basically the deal is, that if you let your pH go high, you are going to get in a scale-forming condition. That's what's causing what you are seeing. If you keep your pH around 7.4, you shouldn't have a problem.

FWIW, your Ca is not high. I qualify high Ca as 500+
. You're not there. IG plaster pools generally run 400 or so ppm as a rule.

Michael