I think there is a combination of things occuring here that are creating high pH and high CH.

The aggregate is still curing, and causing the pH to rise. With a pH of 8, the SWCG is at its minimum output regardless of the output setting. Therefore I can well understand the 40 oz of acid having to be added each day at this stage of curing, but in this case it does seem excessive. However the SWCG is still producing 4 ppm Chlorine, so as Richard says, something is out of whack.

I have just been going through this with my Diamond Brite replastering in my 20,000 gal pool, which may not be quite the same as Joelg's Stonescape. Not being familiar with Stonescape, it may be that the leaching occurs faster with this product.

Another set of numbers from a pool store might help to qualify the initial set.

Pat