The reality doesn't line up with your perception.
The Rams ran it 30 times against Tampa Bay. Yards gained on those 30 plays (in the order they occurred in the game):
0, 1, 4, 9, 2, 0, -3, 1, 2, 3, 7, 0, 5, 2, -3, 2, 0, 1, 0, 3, 15*, 3, 8, -3, 1, 4, 4, -1, 3, 3
*The 15 yard run was the Jefferson jet sweep
And the Rams ran it 29 times against SF in the NFCCG. Yards gained on those 29 plays (in the order they occurred in the game):
3, 14, 0, 0, 8, 4, 4, 3, 6, 14*, -3, 1, 1, 9, 2, 5, 2, -2, 0, 0, 2, 0, 0, 3, 1, -1
*Stafford's 14 yard scramble
AlbaNY_Ram