Anchell & Troop's TD-201 Two-Bath developer is (in my opinion) the best two-bath developer with current BW films. Here is the formula A Metol 5gr Sod. Sulfite 100gr. B Borax 2 gr. Sod. Metaborate 5gr Sod. SulfIte 6gr. Sod. SulfAte 40gr. --A 3mn + B 3mn, with continuous agitation in both. However, I would like to improve sharpness reducing Sulfite in A. I tried to use Thornton's formula for A (metol 6.5 gr + Sulfite 85 gr.), but I noticed a loss of activity with a lack of contrast. So my question would be: reducing Sulfite by 25% in A (to 75 gr.), how to ajust the proportion of metol in order to maintain the same level of activity than with 100gr. of Sulfite ? Increase metol ? add a pinch of Borax ? something else ?