I solved the problem by reworking the recipe and substituting Dolomitic Limestone for the plain Limestone AND for the Mag Oz. I looked at their bagged stock of Dolomitic Limestone and found it to be extremely finely divided. So fine and dusty that the mill staff insisted on adding mineral oil to my recipe. On asked the staff which they had been putting in my mineral mix, they didn't know for sure. I don't have this problem.
Dolomitic limestone is a mixture of calcium and magnesium carbonate.
In the soil, hydrated lime is more soluble and has a higher calcium carbonate equivalent than dolomitic lime. Any lime material can be processed to a given degree of fineness. Typically, the finer lime is more available but costs more. 112 Classroom Bldg.