In 2005, yes, I do think they were an aberration. Well, Kelme and Telekom were also aberrations, so maybe not so much an aberration, as a minority. 80-85% would not even apply to the Tour de France, that number would be yet again smaller, perhaps 60%-70%. Which would put the GP Rennes(or analogous smallish French race) at 98% clean for 2005, which I would think accurate. There was an enormous amount of anger and animosity in 2005-ish around those who had decided to continue and those who backed off. That animosity was the root source of so many of the leaks that occurred.
Your point on little fish is going to be impossible to explain to the satisfaction of the conspiracy minded. But what I would ask that you consider is that in an environment where highly effective doping is receding, but yet to be eliminated, you end up with an odd coexistence of highly talented athletes winning and less talented, yet doped athletes winning. Also, in this part doping/part not environment the risk/reward ratio is very different for the highly talented athlete, as to say, he can still have a highly successful career without doping. Of course, doping would increase that even further, but still, he would be able to earn well clean. Only pure sociopathic greed causes this highly talented rider to choose to "win even more!" than they could clean, and dope. A less talented athlete would not have a similar risk/reward ratio. They would "need" the doping to succeed in any form, and in great quantities, so the risk of being caught increases quite a bit. Just consider it. Not meant as an absolute explanation.
This is a bit of my argument about cleanER cycling. My bar is different than yours, i come from racing in the 90's, where no matter what the talent, you were finishing at the back of the race w/o doping. That set my "standard" and any improvement from this standard was improvement. So, what I observed over the last 15 years are slow, imperfect, improvements. Sometimes(certain events caused) the number of riders doping reduced, sometimes the efficacy of the doping methods reduced(due to lower doses/better testing) even though riders were still doping. Either way, this allowed clean riders to succeed in way that was not previously possible. Even if they were still beaten by dopers, it was 5-6 dopers as opposed to 185 dopers. This is where my annoyingly optimistic tone comes from. I know you guys want an absolute, which I've made the mistake of trying to give/prove. The reality is a slow and painful march from black to grey to less grey, and hopefully to white.