DK-50 is not a fine grain developer and was intended for LF photography although it will also work with MF.
A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.
~Antoine de Saint-Exupery
A lot of good suggestions. This is another: go "grainless" with XP2. As much as I like the silver based films, all my 35mm negative enlargements to 16x20 with XP2 have much less visible grain than those with T-max 400.