I'm actually still not down on the defensive play-calling. Individual mistakes accounted for 209 of Georgia Tech's 401 yards, and even when the Hokies' staff was on the wrong side of a nice play-call by the Jackets, it only went for decent yardage if there were mistakes by the players, too.
https://virginiatech.rivals.com/news/the-final-word-virginia-tech-defense-v-georgia-tech
https://virginiatech.rivals.com/news/the-final-word-virginia-tech-defense-v-georgia-tech