Perhaps Instead of buffing some of the lower DPS burst or dot casting/spreading disciplines damage out put give them something unique to the pvp scene.
Sage/Sorc tel/light add "can be used whilst moving" talent to the 60-68 passive section so that they can cast on the move with more of their abilities. This could make up for having a lower burst by making them extremely mobile as they rarely ever have to stand still.
Add a passive to dot specs who have no burst therefore are not a major threat to most players in a WZ (generally) which causes a debuff to healing once the dot runs out it adds a debuff or perhaps if its cleansed to early , so that they can add to the game by giving healers or players with great + health returns on dcd's, a rough time.
VG/PT's just add the trauma regulators ability to the PT list which will give them a nice survival every 2 mins without going overboard un-like the commando has with reflect, trauma regs, adrenal rush, plus its own castable heals.