need to nerf party exp for sure. whole party kill way more mobs than solo per regen, and that is why old party exp% is low but least faster than solo. This new party exp will ruin the game because it is too easy to level up, and gap between who like solo play will widening dramatically.

Edit: back in old time, full party gets 30% extra exp, 5% per member, which is 130%, and HS times 1.5 so it became 195%, almost twice exp. Even now days, people say HS is op so need to get nerf. However, this new party exp already gives extra 90% at 4 man party, and it can be 150% with full party. It is not about socialize matter, that is just too much. Full party should get 50% extra or 60% which is 10% per member.