The only thijng i didnt like about level sync was the fact that you can take it off at any time and just one shot an enemy if you were in trouble.

To fix this i would add..

*Level sync can be activated at the start of every leve, quest, raid etc., and and wears of upon comletion or failing..
*Level sync can only be activated and deactivated at Aetheryte Crystals, and nodes.
*Each player should have the option to equip there own level sync and not the party leader.