We had experience on defense, but I don't see why you'd call it a "scheme" problem. For the most part, our front 3/4 were losing on the line of scrimmage. For example, against FSU, Winston went un-harrassed for the game, and FSU could run or pass easily. When FSU faced Oregon, Winston was horrible because he was hurried. Duke, UNC, and GSU weren't really pressured.
In 2008, we had 34 sacks for 252 yards
In 2009, we had 25 sacks for 164 yards
In 2010, we had 17 sacks for 114 yards
In 2011, we had 22 sacks for 146 yards
In 2012, we had 28 sacks for 176 yards
In 2013, we had 34 sacks for 228 yards
In 2014, we had 20 sacks for 127 yards
Last year, we had 61 tackles for loss. for 242 yards. In 2008, we had 95 tackles for loss for 400 yards.
We gave up 6.2 yards per play last year--111th in the country (that's "111", not "11"). It was 5.6 yards the year before, and 4.9 in 2008 and 4.8 the year before that.
Last year was on the lower end of playing on the opponent's side of the ball by even recent Georgia Tech standards. I don't we got much of a chance to see what our scheme might be like because we were getting reliably blocked. And that's with Freeman running free for some sacks. Keshun had 9.5 tackles for loss and 4.5 sacks, leading both categories. Behind him was Paul Davis, then Gotsis. Without Keshun, those numbers would be much worse.