That 5-10% edge is huge when you consider that pros all have unbelievable genetics! If the rumors are true that some pros have broken the 400 mg per week barrier, then all bets are off!!! People also don't realize the the cumulative effects (1.05)(1.10)(1.04) for a tan, steroids and oil is a 20.12% gain!!
You mentioned breaking the 400 mg per week barrier. I recall an interview Vic Richards did with MMI many years ago. He was asked if he used steroids, and the interviewer wrote that he evasively said something like "I'm not saying I do, and I'm not saying I don't". Of course my gut feeling is that he most likely
did use a little gear at one time or another. But I don't have any proof other than the fact that he didn't deny it.
But Vic also went on to say that the body can only use so much gear at a time, and if dosages are excessive, unwanted side effects and health problems can result. He also told Trevor Smith a few years ago that he favored mild anabolics and avoided androgens.
We can conclude that Vic is clearly very health conscious. So it's safe to assume that although Vic probably did use gear (he didn't deny it), he clearly used only low dosages of mild anabolics for short periods of time, which is what he felt was the safe way to use gear. Remember, he has several relatives who are doctors.
