Do not raise the TA level (especially not to 100 -- I wouldn't go higher than 70 with an SWG). That will only make the rate of pH rise even faster. You might consider using 50 ppm Borates to provide some additional pH buffering that won't contribute to the carbon dioxide outgassing that causes some of the pH rise. Also, don't try and get the pH lower than 7.5 -- have 7.7 or so as a target pH.