Still, you're not controlling anything..which tends to also have an impact.
I do think you're probably correct in that there is a "sameness". But, I think that this is more to do about players' ratings being too close together more than anything. We've hit that point where I believe ratings are coming through the most...they are just so bunched, that there is a lot of parity. All of my games have been super close...that's good and bad.
But...I also think that 0 MM fatigue option could be the way to go....players are more elusive, will break more tackles...that alone adds a layer of randomness to the play outcomes.
If you haven't done so, give that a shot.