Setting them to normal actually increases the pace of their no huddle attack. The only noticeable difference between normal and aggressive no huddle settings is that aggressive teams look to the side lines frequently like they do in real life. Because of that I usually set my user coach to aggressive (I run the no huddle all the time) so that my guys look to the side line for play calls which looks more realistic.
For CPU teams the practical result of these settings is that aggressive teams are actually slower than normal (because they're stopping to look to the sidelines) and give user coaches a LOT more time to pick their defensive play. What I do is the opposite of what you do. I set most no huddle teams to aggressive, which slows them down to a much more realistic pace. For ultra high tempo teams like Oregon I set them to normal which REALLY increases their pace of play.
As for how many teams run it, I've found that number to be pretty damned accurate. We've seen a lot of these "every CPU team runs the no huddle!!!" threads and I figure it must be by people that are fairly casual college fans, hardcore NFL fans, or hardcore college fans that only follow a few teams that happen to be in conferences without many no huddle teams. The fact of the matter is, however, that a TON of real life college teams run no huddle offenses. There's a reason why coaches like Nick Saban and Brett Bielema have been
bitching for years about no huddle offenses and it's certainly not because they've run into a few teams that run no huddles. It's because the trend for the past few years (decade?) has been for more and more and more teams to run no huddles as it's an awesome way to keep 1 type of D personnel on the field, wear out the D, and dumb down the D's play calling and other various things.
I couldn't find a good article on how many teams run no huddles, but I found this one from 2012 about Arizona (RichieRod's 1st year there) which lists a bunch of teams (many AQ ones) that started running the no huddle for the 1st time in 2012 and a good quote by Jim Mora where he says how rare it is to see a team go into a huddle.
Spoiler
From
here
Urban Meyer has done it in his first season at No. 12 Ohio State, so has Larry Fedora at North Carolina. The Big 12 is already full of no-huddlers and there are plenty of new ones out West, including No. 22 UCLA and both Arizona schools. Kentucky, No. 23 Tennessee, Colorado, Syracuse, Miami, Mississippi, New Hampshire — the list of no-huddle newbies seems to go on and on.
"It almost seems like an anomaly these days when someone gets in the huddle," said UCLA coach Jim Mora, who has the Bruins at 2-0 after switching to a no-huddle scheme. "You don't see huddles. You see up-tempo, fast-paced offenses. You see a lot of formations and movements, plays that have multiple options. It's fun to watch, tough to defend, I think it makes the game exciting."
It sounds like you need to increase the recharge skill for your DCs. This (and up tempo for OCs) helps a TON with fatigue when facing/running the no huddle. It's so effective that I only allow my OCs to get 2/3 for up tempo and I usually don't allow my DCs to get above 1/3.
I've faced no huddle coaches that have OCs with 3/3 and they never get tired. I've also faced ones with 0/3 and they wear themselves out so terribly that on medium to long drives they end up with CBs @ WR and TEs/FBs/DEs/DTs on the OL. I HATE it when they do this because it usually kills their drives.