Just my thoughts, not an authority.

According to my calculations, your water right now has a saturation index of 0.70 This number will go even higher if as the temperature increases. Ideallly you want this to be below 0.30 At 0.70, I would expect you will get calcium scale at the waterline, and quite a bit of scaling in the SC-60 cell. To keep the cell from getting overly scaled between voltage reversals, I would reduce the time between voltage reversals to something less than the standard 4 hours, this will shorten cell life, but it will keep the cell from becoming excessivly scaled. I'd try 2 hours and watch for build-up in the cell. You will probably get little white flakes of calcium in the pool each time the cell reverses and sheds the build-up.

If you want to run the PH that high, you'll have a lot better water balance if you can get the Alk down to about 80 and the Calcium down to 200 or less. It'll be a lot easier to manage at those numbers.

The alk can be dropped with acid and aeration, but the Calcium will need to be reduced through a water change or some sort of softener setup.

Have you tested your make-up water? The nature of your make-up water may factor into the plan as well.