Krichter:
I don't have too many sources at home but according to Petr Kacha's site, Hans Dortenmann was the highest scoring pilot in the Dora:
http://www.luftwaffe.cz/dortenmann.html
However a number of other pilots scored substantially flying the Dora as well like
Anton Hackl as commander of II/JG26;
Waldamar Soeffing;
Peter Crump;
I am drawing a blank on other names, but I & II/JG26 had a number of younger pilots who arrived later in the war & managed to score a number of victories while trying the D-9...but like I said above my sources are not at home & my memory 'ain't what it used to be...'
NM