Honestly they should make bundle vet only but increase the damage of the fusion gun. As of right now the fusion gun is a carbon copy of the melta gun. The fusion gun should be better than a melta since its the fire dragons specialty. There is a reason you see them as kamikazee anti tankers rather than used in actual combat. The fusion gun play style is much to slow for Eldar combat. Marines can tank a few shots while the gun warms up, Eldar can't.