@Mythra
It's good to hear your on the final testing phase but I am wondering what sort of balance are you after for PVP/PK, assuming the same level of equipment, skill, and character level will it be 50/50 chance your after or each class has a counter?
Also will the testing consist of PVP in both single 1v1 and large scale 5 v 5 or greater?
If your doing large scale battles might I suggest having a large scale fight on a small map like the wall with 2 Taoist 2 Wizards, 2 Warrior, and an 2 Assassin vs the same team composition.
Obviously you are aware of tempest wars on narrow maps but unless Beckon, and Dance are available which I am assuming isn't the case on every map you might have to consider Lowering Tempest/Firewall Damage in PVP. As walking through a wizards Floor AOE is the hardest thing to get right on the PVP side of things.
Personally I don't mind AOE on floor hurting but from past experience on Zircon fighting on the wall on a melee character was not fun in the slightest even with x5 advantage in full 79 set with good gear melee were about as much use as a chocolate fireguard. They couldn't move through the AOE to approach the enemy even if they stealthed (Which at the time gave them a 50% damage reduction on top of the x5 reduction) so all the fighting was done by the Wizards and Taoists.
Which effect group synergy greatly as you only really needed 1 competent melee for the boss so they just started to fill the groups with casters and who ever was further in on the map normally got the boss as the others had to fight there way up to the group up front and god help them if they were waiting on door to 2nd map with tempest on doorways with pets lined up ready to blow up.