It's an all around problem. Wake doesn't really want to get into a gameplan where they just get into shotgun, drop back, and fire. It worked against Army because, well, they had better athletes than Army. That goes out the window against Pitt/Clemson/UNC/NC State, even Rutgers in their depleted state showed a bigger DL can attack the interior.
The mesh is an integral part of the offense because keeping defenses off balance is how Wake makes up for deficiencies in talent. The more options you give a defense to have to defend, the harder it is. It's not the reason Wake lost, it's just part of the overall problem. Unless you get better on the OL(especially the interior), you're not going to do well against those bigger and faster DLs. PFF isn't everything but the interior *consistently* grades much lower than the tackles, and was the same last year. Part of it is injuries, I know Jurgens/Petitbon/Sell/Maginn were all a bit banged up towards the latter part of the year, but that's where the game is won and lost. We saw it in the national title game. Football at its core is about blocking and tackling. The interior just hasn't been able to hold up.
Scheme has been a slight issue, I(and Conor) don't really understand screens to guys like Roberson. Morin I guess, but Roberson made no sense, that should be where Ke'Shawn thrives. When they do drop back from shotgun, a lot of times they have these long developing routes and that's what makes me want to bang my head on the wall. If you know you can't have those kinds of routes when you're running mesh, why do you think you can run them there? Which in turn has Hartman pushing down the field more than he should or taking a sack because the interior just gets blown up