GM, this is just a suggestion.
If you really want to get rid of CE Users, you should increase the penalty.
If the game guard can't stop them, then I know you can do it if you don't want players to leave this server
for only one reason. "CE"
What I mean is, real penalty. 50% of MP is not enough. Who cares about MP if you enjoy hunting.
Just like this,
1st ban = Weapon will be gone / lost.
2nd ban = Set will be gone (armor, pants, gloves, helm, boots)
3rd ban = Clean account (all items will gone)
CE users are not afraid of your penalty that's why they keep using it.