I suggest to remove exp penalty. Please pardon my english as i am not fluent with it.
Pros :
Promote more party leveling( Why? gathering in group to kill a harder monster in a harder map = more reward instead of just soloing)
Makes low dps class more effective(Many people says that the exp penalty is for balancing. But imo it doesnt matter and in fact its worse for low dps classes. So when able to grind at a higher level map, “Mainstream” Dps may not be able to tank the hits from the monster, thats where tank/healer comes in) Why did i say it does not matter, Many will say because the high dps can take on these map solo too sometimes. But heres the fact. Tank getting ksed by dps like mage, archer almost everywhere. Does this slow the process of leveling for the tank? Yes it does.
Cons : as mentioned in the pros DPS will leveled alot faster than non dps class.
EXP Have to rescale from a level 1 monster to whichever the highest monster there is.( I seen tosbase most of the monster exp are only about 100-500exp no matter the level http://www.tosbase.com/database/monsters/
if it is the truth, then IMC would have to “revamp” the whole game and the exp would be something like a level 1 monster with 10exp and a level 50 monster have about 500exp and level 100 with about 1k exp, just an estimation)
Probably 1 good way not the best and efficient to make the game better.
Just my own opinion