Response to Rodinal w/sodium ascorbate

Is the 4 grams per litre some kind of absolute found by testing? Or am I OK using 4 grams per 8x10 developing volume? I stick with 10ml of Rodinol syrup per 8x10 film unit whether developing one sheet of 8x10, 1 roll of 35mm or 8 sheets of 8x10. This is kept constant on the syrup whether diluted 1+25, 1+75 or whatever dilution I use. I do mix more than the minimum recommended amount each time so I generally have more than the 10ml per 8x10 film unit in the working developer. Any problems one can come up with for using the 4grams this way rather than with a per litre blanket recommendation?

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