...is drawn-up with the premise that there may always be one guy to beat on the defensive side, if they play smart D.

The 10-1 D is NOT smart football!?!?!?!?!
Anyway, playing with gaps between the OL and with FOB tackling for the 1st 10yds (D gets to Read-N-React, then ABC), we use the FB the majority of the time here in the MWEFL. Basic concept: Two OL "open" the crease and the FB pushes it all the way open. Then it's up to the RB to follow that FB's block and earn his pay!
Play 1: FB pushes blocks aside and RB makes his cut. Fast forward to middle of play!
Play 2: FB somewhat blocks looper, allowing RB to counter.