So with this being said. Good luck fighting the boss that drop crowns all by yourselves. If people are smart, they won't come help you in the battle if you really want to put this rule into effect considering the fact that people with full dl who don't owe anybody are still dicing for drops that the...
Depends what mobs you train on. I like heroic and i tend to get about half a bar to a bar more of xp with misc heroic lixirs combined with super xp. It is cheaper as well.
I get 2 and 1/2 bars per lix at 134 training on fire boggans. I also use heroic haste, energy, and health regen lixers as well as restores because I usually have at least 2 on me at once. I only use a golden blade of ice as my offhand with adamant axe and do pretty well solo leveling.
I am not a high enough level by any means, but I don't think it should just go to the next highest person on the list but to the highest person who needs it and actually participated in the particular boss fight. That would be the most fair way to do it if you're going to go by levels. If they want ...