Nah, its amazing what type of athlete can be manufactured with performance enhancing drugs. Miami could have athletes as fast and strong if it wanted. You know how much drug testing for steroids costs? An insane amount. Its not like the "5 panel" drug tests people get for normal jobs. Have to have bloodwork, check testerone/epitesterone ratios, compare before and after. It's a complicated process, not to mention that designer steroid makers are ahead of the testing.
NCAA isn't going to have players regularly tested. I cant say all players at elite programs are juicing; but I'd say a good percentage are. My guess is the Miami athletic department is very very strict about performance enhancing drugs when other ADs understand it's just part of the business of football and as long as team doctors are monitoring, it presents a relatively low risk to players.