Sodium sulfite added to Rodinal

I am curious about the effects of adding sodium sulfite to the Rodinal working solution. I have read vague references in threads refering to the grain/sharpness trade-off; speed increase; and gradation changes, specificaly that the compensation effect is reduced. My questions are: 1: What ratios of sodium sulfite have people tried,liked, and why. 2: The sweet spot as far as regards the grain size/sharpness trade off. 3: What happens to the gradation. Specifically, changes to the curve. 4: The films I use are APX100, Verichrome Pan and HP5+. Any experince with any of these emulsions whould be helpfull.

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