Hi,
I put your test numbers into the "watergram" balance calculator wheel that came with my Taylor test kit:
pH 7.2, TA 73, CH 127
Assuming a water temp of 100 deg (a guess), it suggests you're too acidic, so it's possible you're fighting to pull it in the wrong direction.
With calcium hardness of 127, I'd add total alkalinity increaser until TA hits 100-120. Then check your pH. Your water will be in balance at a pH of 7.5-7.6 and 100F. You can use some pH increaser/decreaser to get it in that range. In my experience, that's a relatively easy balance to maintain with a dose of alkalinity increaser once every week or two.
It's important to have an accurate pH test. Next time you bring in a sample to be tested, use both your test strip and the dropper test on the same water, and compare results. That will give you an idea of which is more accurate.
The problems I've had with remaining water balance have been soft or hard water. I've had water come out of the tap with a calcium hardness of only 20-30, and as much as 200. The former makes it hard to keep pH up, and the latter makes it hard to keep pH down. When I fill, my calcium hardness is usually on the low side, so I use calcium increaser to get it roughly around 100. When calcium is high, you can try using a stain & scale reducer (aka an acid blend). I'm not exactly sure how it works, but I think it causes some of the excess calcium to precipitate out and then get caught in the filter.