Industry standard is different than tfp standard. 2 different approaches to pool care. Mind boggling that the FC standards are that far off but it seems to be working for both.
Why can't you drain and fill a pool in the summer?
if you want to raise pH... only use borax. it wont raise TA. But pH should rise naturally when you aerate. Get a fountain installed in a jet or point the so they break the surface water. This will raise pH.
I wouldn't have. pH generally creeps up. pH of 7 isn't that bad, you could have aerated the water and pH would rise quicker. Jets pointed to the surface or a foutain installed.
Will be interested to see what your pool does with that much borax.