It has been said here that it is harder to lower TA after Borates have been added. I lowered my TA to 70 then added the 20 Mule team/MA. It has been a couple weeks and my TA is now reading 100 on both the pool stores testing and my Taylor kit. We did have to add about 3 inches of fill water. The water from the tap has a TA of 200. My PH is still drifing up from 7.6 to 8.0 in about 3 days and even with all the added MA (2 quarts evert 3 days) the TA is locked at 100.
BTW, I did order a TF test kit and an Apollo stirrer yesterday. I'm looking forward to using them!