I think we are heading in the right direction with the SC coach, it will just take time. The DL is just plain undersized, and some of those guys are just not tall enough to carry 280 pounds and be effective. It is a matter of the guys you have, and how fast they can make gains. All of those DL at Iowa have been in the weight program for 4 or 5 years. I don't know much about SC coaching, but I had heard some not so great things about GC's strength coach.
Unfortunately all this takes time. The loss of Scott H. on the OL was a huge blow to this team. The guy was a beast, and ISU does not have anyone like him. KO is pretty good, but SH had the mean streak that good OL need.