I remember one of Ben's posts in the forum where he said that the high pH pools were not quite as useful as he first thought but I could not find it. I do know the original concept was done by United Chemical who make a line of bromine based pool treatment products that need a higher pH to work properly. Could there be cause and effect here? Hmmm...

As far as your pool--how are you testing? With results like '100ish' for TA and '7.5ish' for pHI suspect you might be using strips but the bottom line is this, if your pH is rising too fast (and you are NOT dealing with plaster that is less than a year old and therefore not fully cured) then your TA is too high. Period. Lowering your TA will lower the speed of pH rise. Also, when you do add acid do NOT lower the pH too much.
The lower you place the pH the faster it will rise. Period.
My suggestion is to drop your TA to around 70 ppm and do not lower the pH below about 7.6 when you do lower it. When it climbs to 8.0 lower it again.
Hope this helps.