Alternate developers for tech-pan

Does anyone out there have any experience using developers other than technidol for tech pan. I'm very interested in the Photographers Formulary developers, because one of them promises an increase in film speed by 1-2 stops or so, while maintaining tech pan's fantastic sharpness. At EI 50 or EI 64 tech pan becomes a much more attractive film to me. Does anyone have any suggestions or comments? I would also be curious to know how these "unapproved" developers affect tonal range, sharpness and grain.

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