With Efke 25 ( and Pan F, the late Panatomic X, and the late APX 25 ) reduced agitation allows the film to develop fully without building highlights whose density is superproportional to the exposure.
Beutler / Neofin / Agfa #3 ( the 1920's precedent of Beutler ); FX1, FX2, Rodinal, FX-39, Aculux 2, PyroCat.... all can be adjusted by dilution and agitation to give gentle contrast. Even XTOL can be run with reduced agitation, and contributes a very calming effect to Efke 25.
Using Rodinal as an example, agitation for 5 seconds every 5th minute is more than adequate and allows sufficient time for the shadows to build while the highlights rest. Using 1+100 for 18 minutes as the starting point with conventional agitation, look for a development time between 22 and 30 minutes. A water stop is sufficient with Rodinal, and I like TF4 fix very much. I do NOT presoak.
With XTOL, 1+2 or 1+3 dilution works very nicely, with the 5 seconds per 5 minutes agitation pattern.
I get a completely different curve shape with many films with a Jobo than I do with 'semi standing development'. Consistent, documented, predictable.
Good luck.