There are fixes but the challenge is that the fixes directly scheme against how Heupel wants to spread the field. Adding additional blockers, targeting the flat for throws, wheel routes to RB, sweeps, even rollouts all require a major scheme change away from wide splits and full field coverage by the O. We attack the middle of the field way more often then other teams because we spread the D out. We fail when defenses have the athletes to cover the run with light boxes because that takes away the main advantage and allows them to comfortably spread their defensive backfield out.
Heupel said it himself: the reason we do not do a lot of off tackle plays is because the wide splits cause more defenders to play outside instead of in. The Film Guy on Youtube had a good breakdown on this as well. Heupel runs what he calls a "pace and space" scheme to open up green grass to exploit.
We would have to really change a lot of what Heupel wants to do in order to scheme around our weaknesses. We saw some of that last year with Milton, so I would expect Heupel to keep implementing changes because our normal scheme is just not working with the pieces we have.