I shoot efke in 25, 50 and 100 in 120 and 25 and 100 in 4x5. I rate the 100 at 50. Most of my testing and experience has been with ABC Pyro + in a Jobo. This film has great latitude. I have used D76 1:1 20c with 10 min and had very good results. ( a few of these batches were 35mm).
Have you tested to determine PEI and development time for your most frequently used films on your equipment?
Don't be discouraged by the initial disappointment. These are great films to work with! Just get them dialed into your system!