Short and sweet, 1 v 1 pvp pales incomparison to how exciting a war scaled battle would be. Class difference would be less important as it would be about working as a unit.
Simply put make titles accesable in a team somehow, split the points, give it to the guy who got last hit(kinda unfair is u got the unlucky smoo just purely healing ), whatever , just make it andvantageous to pvp in a team.