TA is mostly a measure of the carbonates (especially bicarbonate) in the water and these not only buffer pH but are a SOURCE of rising pH in their own right due to carbon dioxide outgassing. Pools are intentionally over-carbonated to provide carbonate to protect plaster surfaces (calcium is added for this purpose as well since the water should be saturated with calcium carbonate). As shown in this chart, there is more outgassing at higher TA and at lower pH. The outgassing of carbon dioxide raises the pH with no change in TA. Adding acid lowers both pH and TA.

The extra aeration from an SWCG increases the rate of carbon dioxide and pH rise. If you have short pipe runs, then undissolved chlorine gas can also outgas and cause further pH rise. For an SWCG pool, the TA should be lower, usually closer to 70 ppm and certainly not as high as 100 ppm. The Borates provide additional pH buffering and are NOT a source of rising pH since they do not outgas. The borates do not change the amount of acid you add over time, but they slow the rate of pH rise down so you don't need to add acid as frequently. They also help to prevent calcium carbonate scaling in the SWCG cell since they roughly cut down the pH rise in half at the hydrogen gas generation plate.