FWIW. As was stated earlier. Playing defense is always tougher when your offense is an up tempo style. I used to love up tempo back when it was becoming new. However, procedures have been added for defenses to slow the pace down due to substitution and or "injury".
I seriously look at Oregon. They have dramatically slowed down their pace even though they are still a spread offense, and the defense has improved all the way up to 37th nationally in total defense. Oregon, this season, under Cristobal have consistently ground out 15 play 6 minute drives that give their defense rest.
So while tempo can give the offense gaudy numbers, but it also destroys the defensive numbers. If you don't like shoot outs where you have to outscore opponents then you're never going to be happy with Frost. There hasn't been an actual up tempo style team that has had great defense.
Also. Tempo does NOT equal "Spread"