You must MAUL and physically dominate for 4 quarters both of these two teams (IU and NW) until you 'break' them. And you will break them if you do that.
I think our desire to be 'balanced' at times hurts us. A single incompletion or sack can kill a drive. So can a negative rushing attempt but the odds are less of that happening if your O-Line is good. Continuing to pick up positive yardage on the ground not only can 'gas' a defense but it keeps the chains moving and your defense off the field. If you do it well you will 'break' a lessor opponent in the second half.
I need to update my post from a couple of seasons ago but KF's record at that time was awesome when Iowa runs the ball 60% or more. When it dips below 60% his record is below .500 at Iowa. The record differential was not even close. Are there exceptions to this rule? Sure but as a rule of thumb running the ball and stopping the run are key ingredients to long-term success.
You want to win games; great O-Line & run the ball and do not give up big plays on defense.
I saw a comment about Gettis earlier and I may be the only one in our fan base that thinks this is also a huge issue. It's not just 'Gettis' but also not having McMillan playing many snaps. Our center, JF, has played above my expectations this year but he is 'under-sized'. Now we are playing his backup who is even more under-sized at the right guard position which means we have 2 under-sized lineman in the middle of our line. We are not getting a consistent push due to leverage issues and are giving up more penetration to NW and IU d-lineman. This causes pass-protection/breakdown/hurries and negative/min yardage rushing attempts. Not every play but again it only takes 1 sometimes to derail a drive.
If Gettis or McMillan cannot play I would start Boeffeli, Van Sloten, Orne or another lineman who have the physical characteristics to play Big Ten football. Size and physicality matter at this level of football and above. Not all big men are good players but you must put out the best combination of big o-lineman.
It's no secret that the best team in this league this year, Wisky, has the best O-Line and that O-Line is massive. It's the most under-rated aspect in football and this is our most pressing current issue IMO. I'm OK with one under-sized player but when you start multiple players under 6'4" and 300 lbs you are going to start having issues and inconsistency in offensive results.