I'll throw in my two cents.
Most of my customers never ever use ph down, whether it be dry acid or muriatic. If they use anything at all to adjust their ph it is ph up (soda ash). Many of my customers use only 12% liquid chlorine, with no pucks, and hardly any use cal hypo. We've always figured that this is because of our city water's ph of 6.6, alkalinity of 30, acid rain and having properly alkalinity balance.
Also, we've sold around 30 SWC's and haven't heard a complaint yet of high ph. These people tend to range from 7.5-7.8, while our normal customers tend to range from 7.2-7.5.

Brad
Waterworks Pools