Here is an experiment to try.
Coat the foggy emulsion and then add 1 drop of TAI. You now have 90 ml of emulsion with 1 D Tai assuming 100 ml of TAI free emulsion. Now coat that. Add 1 D. Now you have 80 ml of TAI + 2 D assuming 10 ml / coating and etc. At the end of the series, test. The first low fog is the one you want. So, if 80 ml with 3 D is best then that is your aim, or just use what Jim Browning uses.
If you overshoot, you lose speed. Not a big problem for uss though.