I took Miami at +4 early in the week and I still my chances with that play. Georgia Tech gets a lot of respect from bettors at home, especially with Paul Johnson coaching. But I, like you, feel the teams have evolved differently over the course of the season: Miami getting better and Georgia Tech staying stagnant or maybe even gotten a little worse.
I love betting Paul Johnson-coached teams as underdogs, but not so much as favorites.
I don't feel confident enough to risk more than a single unit on the play, though.