I am very puzzled by what could be in this developer that separates. AFAIK, the ingredients go into solution. Once in solution just gravity should not separate them. Developers are not like milk, which is not a solution but an emulsion. If subject to low temperatures its possible that something crystalizes but should go right back into solution once warmed up again.
After reading this thread, and having recently had some serious inconsistencies in neg density (getting thinner and thinner), I gently rolled the two containers of WD2D+ around for a couple of minutes, then processed a roll. (And noted that there was sediment in the B bath)
Voila!
I must have gained a stop in speed, at least. Maybe two.
Just FYI;
Stock Solution A
Metol Sodium Bisulfite Pyrogallol EDTA, Tetrasodium Salt
Stock Solution B
Sodium Carbonate
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