Aw, the age ol' question. How to leave a TFP pool for a week? I'm trying to solve for that with automation. But manually?
If you only add MA once a week, does that mean your pool stays between 7.2 and 7.8 for a week normally? Then, yes, bring it down to 7.2 before you go.
If my ol' brain remembers correctly: the bigger issue might be the chlorine. How are you doing your calculations? It's my understanding that while it doesn't hurt to goose your chlorine level (you can bring it up to SLAM level and it's safe for the pool and for folks to swim in), that doesn't mean the chlorine will last. The chlorine you add above and beyond the recommended range will burn off faster. I think because it then exceeds the FC/CYA ratio, which is what protects chlorine in the pool. Put another way: if you've figured out that your pool uses a half gallon of chlorine a day, and you dump in three gallons to last six days, you'll find that a lot of that three gallons will burn off quickly and by day two or three you'll be back down to a gallon or less, which will then burn off at your normal rate. So you could be exposing your pool to FC 0 a day or two or three before you get back. Sorry, I don't know enough about this to do the math correctly, but it's in that ballpark.
That's why most rely on SWGs or pucks to leave their pool for several days. Pucks have their own set of problems for a TFP pool, but I know some people here use them in limited ways, and this is one of those ways, because they are slow dissolving and will dose for some number of days. Those that get away with the puck method have pools that lose or exchange water regularly (like because of large amounts of rain).
Alternately, you could set up a handful of small bottles (like plastic soda bottles), and put in each a daily, or every-other-daily dose of chlorine and acid (not mixed together!! Separate bottle for each!!!). Mark the bottles with a sharpie pen: MON, TUE, WED, etc. Then just ask a friend or neighbor to drop by once a day (or every other day) and dump in the bottle(s) tagged for that day. A few minutes apart, if you have acid and chlorine scheduled for the same day. Or at least at opposite ends of the pool.
Include a case of beer for the "doser" and you'll be all set.
I want to reduce anything that is electronic that can break. If I could figure out how to run the pool without pumps I would do that. Adding a SWG in is just one more thing to break at the worst time possible.