Some sugestions:
1 - Root Crystal should restore sta for warrior classes, mana to mage / priest classes and hp for archer classes. About 20% for mana/hp should do.
2 - Present mechanics for bosses to make them less robotic and direct damager. And make repeatable bosses for extra XP instead of field.
3 - For god sake increase the exp gained solo by 50% of recent value and party xp by 25%. Not everyone wants to play party. Please listen at least to this plea.
4 - Increase number of channels and/or mobs per map, make crowded maps mobs not aggro
5 - Make any class able to use shield sub-action, but much worse than tankers. Mages are pure paper, solo mages suffer too much 
