I like the Efke pl100, too, using ABC at 2:1:1:15 - Michael Smith's normal dilution of 1:1:1:7 develops just too fast. I also rate it at 50.
J&C now has charts of the Efke films up on its site. The pl100, to my unscientific eye, seems to have a very long, straight section with little in the way of shoulders. Perhaps someone with more knowledge can take a look at the charts and explain more of what they might mean.