Brian
Are you sure? I figured the chord was "flat on top" to escape the need for area ruling.
Was the wing thin enough to produce little Waist drag? The fuselage is rather 'unassuming' in section?? Also, the "inverted planform" of the wings, added to anhedral, made the a/c very "manouverable" ('unstable'). This I believed to be the Deal with the Devil that killed so many Germans. IE, a natural tendency to the Roll, requiring little if any draggy aileron input. The 104 could ill afford to kill any of its lift just to turn.