Couple of things -
1. No need to report bromine (Br) as you don’t have any bromine in your water. Your pool is a chlorine pool. Only reporting FC/CC matters.
2. Your levels look great. Don’t obsess over things like calcium hardness or salinity (which I know you did not measure). They are very slowly changing variables and they are not as important.
3. You only need to adjust your TA if you can’t keep your pH under control. Remember, your pool is swimmable and safe at any pH value between 7.2-7.8. There is no such thing as “the optimal pH”. Most pool water with higher TA levels likes to be at a pH of 7.6 or above. So don’t obsess about lowering pH until your pH starts to go over 7.8.
4. If you wish to lower your TA, then you need to use the acid-aeration process which can be found in PoolSchool. Muriatic acid is, or should be, available in any pool store or hardware store like Home Depot or Lowe’s. Heck, even my grocery store sells MA with all of their pool chemicals. You want 20 Baume, which is 31.45%, muriatic acid as it is the most concentrated and the best price typically. Sometimes you’ll see “low fuming” or “green” MA but that stuff is just 15% MA and it is often sold at the same price as the concentrated stuff (so you’re paying more for less). Hardware stores sometimes carry the concentrated MA in their concrete and building materials section because contractors use it a lot. Lowe’s is known to put all of their pool chemicals out in their Garden section so you might find it there.
Two questions -
1. Do you get rain where you are?
2. Please measure your pool fill water supply and tell us what your pH, TA and CH of the fill water is (don’t bother measuring anything else but those parameters).