When running a quest that would give XP, but gets converted to NO XP due to a higher level character, do not increment the completion count.
The current mechanism increases the XP completion count which stunts xp growth in raids and pugs due to the sudden possibility of an overlevel char. This mainly affects the Epic quests due to current quest scarcity.
By blocking the XP tick on completion, the quest would still finish; however, there would be no xp loss for running it subsequent times with at or around level characters.
This mechanism would increase the filling speed of raids etc. where now people may get xp unless grouping with 25s etc. and have adjusted accordingly to avoid docking xp.