ozone doesn't effect pH, but pH does effect ORP.
You're fine on your calcium and alk levels, imo. I would continue to use kalk if I were you. As your tank's demand increases you'll need to add more and more eventually reaching a point where you're adding all your make-up water as kalk and still not keeping up. When that happens you need additional sources such as a calcium reactor, b-ionic or separate calcium/alk additives to make up the difference.