I don't have my Grub Street series with me during the summer, but can refer to some older, less detailed sources. Those of you who don't have any of the
Above the Trenches series (and you know who you are!) are really missing something.
Voss bagged 27/48 two-seaters, a fairly high percentage I believe, but his claims were over 90% accurate. As CO Jasta 4 Udet got 39 kills, including 10 two-seaters: mostly Breguets and DHs.
Guynemer was a lot like McCudden: snacked on observation birds with 37/53 or right at 70%.