I disagree about having separate skins. The Hartmann types that wore very elaborate personal marking, to the point where he could be identified easily by the enemy, were rare. In fact, Erich Hartmann is the only example I can think of from WW2. Herman Graf was another, but it is debatable if his brightly colored mounts were ever actually used in combat.
The most important thing regarding the use of the ace missions is balancing the plane pairings well on an individual frame basis. Nef does this well, others...not so much.