Adjustments in pH are best done by adding a bit, waiting, and retesting or by using a demand test (if you have a K-2006 test kit). Treatment tables and online calculators cannot (I repeat, CANNOT) determine how much of a chemical you need to move the pH to a certain number since other factors also come into play.
As far as pH goes, many salt pools tend to fall into a range of 7.8 to 8.0 and stay there for an extended period (particularly if you have borate at 50 ppm in your pool too). Nothing wrong with that at all. Just be sure to lower the pH once it hits 8.0. If you don't lower it below 7.8 it probably won't rise as fast as lowering it to 7.6 or lower.
Having your CYA higher will not only keep the chlorine in the water, it will also indirectly slow the pH rise because there will be less aeration from hydrogen bubble genteration in the cell (because it will be on less to maintain the chlorine level) which means less outgassing of CO2. Keep the CYA at the manufacturers maximum recommened level (Compupool recommends 60 ppm but nothing wrong with 80 ppm as long as you keep the FC at 4% of the CYA level or higher). Also, dropping your TA to about 70 ppm will also slow the pH rise (once again because of slower outgassing of CO2).
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