Running Game & Tight Ends

I was at the game and so couldn't watch the details like I would on TV, but it appeared they went double tight ends a lot. This seems like it was designed to get the running game going, as I think they ran out of the two TE set many times.

And yet, they didn't seem to get a great push. I wonder why. It feels like we had more hats than MSU did...and we knew where the play was going, but there seemed to be no space in the middle of the line. Why aren't we using those tight ends (purportedly great blockers) to seal the edge and get our RBs around the corner?