I was thinking of having a 100% XP (of base + bonus objective) bonus for victory on a map using a commander’s prestige for the first time (does not apply to the initial prestige type). This applies once each to the 2nd, 3rd, and 4th prestiges. This gives players incentive to give their newly unlocked prestige a trial run and a minor xp boost towards mastery level.
Players who’ve already played their prestiges at this point will still have the one time boost for victory with the 2nd, 3rd, or 4th prestige.