Let me challenge you for a second here. Are there any commercial headphone amp companies that provide distortion numbers that are the result of measurement equipment that would be considered industry standard? How many of these companies own a AP for example?
To stretch a point to make a point, I wonder how Headamp would substantiate the distortion numbers on their electrostatic amplifiers?
I think I've found a market for the Dorkstar. It's mil-spec, of course:
http://www.google.com/patents?id=UZzxAQAAEBAJ&printsec=abstract&zoom=4#v=onepage&q&f=false
i'm not sure how it's any more or less trouble then.... well, building another amp
Also, notice that most beta22 builders already install a Zobel that could be causing ill-effects here.