The references on how the players lack experience, etc. are not the point. As long as you match up OK in S&C as well as athleticism, and they do, you can design a scheme and call plays that can fit what they can do. Remember that formations and the use of motion are all part of the play calls and scheme on O.
What Would You Do?
You are Butch Jones. You now have 17 games of SEC level experience with essentially the same coaching staff with whom you started, as well as bringing half with you from previous stops. You are 3 games under .500 as a head coach and you have won 2 SEC games. One group (D) has many years of coaching experience in the SEC and is performing well. They improved their area's performance strongly in their first season with the help of only a couple freshmen they recruited. They have taken another big step this season using a boat load of freshmen with a handful of talented, experienced guys that have bought into your way of doing things as well as your D coaches ways of doing things. Critical breakdowns are becoming significantly less and the secondary has turned into a ball hawking, quality group with first tier performance by the defense as a whole.
The other group (O) has one guy with good SEC experience and another with one season; uses a scheme you have designed in previous stops that is not working well currently based on the 17 games of performance compared to national rankings; and does not consider match ups or player strengths/weaknesses on either side of the ball in play calling by your OC. You have highly coveted young players, a senior QB, and a few older o-linemen that have practiced for several years with upper classmen that are in the NFL. The play has been uneven, much worse against tough opponents, and some of the players are losing focus and missing assignments repeatedly. There are strong indications that player development is not occurring as it should since your senior QB is being brutalized against good teams and the unit is not rising to the occasion with continuing critical breakdowns, penalties and turnovers.
What do you do to start winning, if anything? Losing is not an option in the question.