Looking at expired acufine and diafine on ebay. Experience with these developers, used or new? Experimenting with Kodak 25 tech pan.

It has been over 35 years, but I have had some experience with all three items. Acufine and Diafine are quite powerful developers, trending toward high contrast, large grain and weak on sharpness. Acufine's claim to fame was enhanced film speed. The slightest overdevelopment yielded unprintable high contrast. Diafine is a 2-bath compensating developer with normal to high contrast (unlike most 2-bath), and fairly course grain. Kodak Tech Pan: a high contrast document recording and limited tech film with extreme slow speed, nearly no visible grain and its related sharpness. It requires a very low contrast developer to offset its inherent high contrast. Acufine would be totally unsuitable for Tech Pan. The auto-compensating effect of the Diafine 2-bath process will very probably yield negatives of excess contrast. Why not try the developers which are already established with Tech Pan? Kodak, then Phorographers Formulary used to sell a propriety Tech Pan developer. If you mix your own, the old POTA formula worked well for me 30 years ago. (Google POTA or check the Darkroom Cookbook.)