Here is what I have set up for the CFM. I played a game to see how they worked and I was overall very happy. It was a low scoring game, but felt organic.
It Steelers(CPU) vs Redskins (me): I lost 13-6, but Franco Harris ran all over me!!! Bradshaw only threw 19 passes, but they were mostly down the field. I made a couple of solid stands inside the 20 to hold them to field goals or the game would have been 21-6.
Human/CPU
QBA: 15/15
PB: 55/50
WRC: 40/40
FUM: 50/50
RBK: 55/65
Reac Time: 55/55
INT: 40/40
PassCov: 55/55
Tack: 50/50
Injury, fatigue, speed parity: 50
Penalties:
Off: 80
FS: 70
Hld: 70
DHld: 65
FM: 55
BiB: 50
RtP: 50
DPI: 65
I am sure Josh's sliders would work as well. It might open the game up a bit more. I prefer more defense. It really all depends on what you are willing to put up with in terms of immersion. I like the lower completion percentages I get. The Vikings playbook seems to work really well. For instance, in that game the Steelers ran the ball a lot. It was great. However, they also used the shotgun, which is not good for 1975, but the playcalling is better.
Hope that helps!