I pre-soak these for a couple of minutes or so in water that is at 20C (same as the developer).
I've used Rodinal and PC-TEA with the Efke films, and my preferred combination is Rodinal 1+100 as per the MDC. As for agitation, I do five inversions at the start of each minute for the first three minutes, then one inversion every three minutes for 17 minutes. Works well for me across a range of lighting conditions, and gives good shadow detail without destroying the highlights.
Water stop bath, & I've not used a hardener, but just taken care when the negatives are wet.