I could not "beat my best doped times clean" because I was a very good responder to EPO, realizing 10-12% gains in functional threshold power. Keep in mind I was using full doses of EPO, too, and not limiting to micro-dosing.
Someone who wasn't that significant of a responder to EPO, or who had only been using micro-dose amounts outside of the context of blood transfusion might possibly hope to equal their doped best times if certain factors weren't maximized at the time of the doping (due to laziness or inattention, for example). So, perhaps a small difference in weight, perhaps a more effective training program...there aren't many areas in which to make improvements and I would think most have to do with having been lazy to a degree before and allowing the EPO to boost your performance previously, but not as high as it might have been had you sorted-out all of these other variables (like diet, or physiology-centric training). So w/o the small gain from EPO (in a poor responder) if there were deficiencies in other areas that can be made-up, maybe there is hope to eek-out a few more watts.
Ultimately though I would think that it's a question that depends completely on the individual and their unique circumstances.
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