Please, someone slap me if I'm wrong, but I am not aware of a successful reef tank (containing hard corals) that doesn't receive some sort of supplementation for maintaining calcium carbonate numbers (that is not done on water changes alone). If you want hard corals for the long term, you need to do something in your tank to maintain proper steady levels of alkalinity and calcium. This can include things like a calcium reactor, kalkwasser (lime water), two part.....am I missing any? It's not unreasonable to see alkalinity drop 1 dkh / day, and I can't see that being maintained by water changes alone.
As far as Red Sea Pro being the best.....as far as I'm concerned, it's the salt that works best for you that is the best. For me, it's IO.