If
I were to pinpoint anything, it would be the fact that you're using that stout Browns d-line.
Now, the Jets line (outside of Winters) is poor at run blocking. The Rams line is better, but that's still a pretty even matchup.
Play a couple of random CFM games using a poor defensive line vs a good back and see how it goes. That will tell you a lot more whether it is a game issue for you or a 'I'm using a good line and should be happy' issue.