T-grain films have higher RP but lower acutance so don't look as sharp when printed. This can be countered to some extent by using a developer that has lower sulfite content than "standard" developers and using it at higher dilution, or at least dilute a standard developer more than is commonly done.(posted 8886 days ago)My suggestions are Rodinal 1:50, D-76 1:3 or even DD-X or T-Max at double or triple the recommended dilution, of course with correspondingly extended development times.
Tech Pan is something else entirely; that film and Technidol are offshoots of the old H&W Control films and developers used by the USN for aerial surveillance photography back in the '70s.
H&W VTE was a high-contrast copy film similar to Kodak's copy film; in fact they could be used interchangeably. VTE Ultra was an Agfa microfilm. The H&W developer was POTA sold in vials rather than u-mix-it.