I backs or split backs?

We were a split back team my first three years as a coach that averaged well over 200yds game rushing. We ran into the problem that we had more true fulback types than two running back types. The biggest reason we switched to the I formation was the midline. Teams were lining their lb's very wide to take away the inside and outside veer. The only play we had attacking the middle with split backs was the counter dive/trap series and this was not enough. Since switching to the I and running the midline our veer and trap game has returned to prominence for us. If they try to play the split look, the midline has averaged close to 10 yds per carry. I love the quickness of the splitback veer. It's angles are sweet to watch. However, the switch to the fulback alignment to run veer has made us more versatile and harder to defend. We have been exploring the spread and wing slot formations with a tightend to run the option because we have so many tweener types that aren't a true tailback or a true receiver. I don't ever see us switching back to the split back alignment because of the midline. My two cents worth.