How I would nerf RDM to bring it a bit more in line:

-Reduce potency of Jolt, Verthunder, Veraero, Verfire, and Verstone. Not by a significant amount.
-Increase the damage of the melee combo and finisher, again, not by a significant amount.
-Change Verraise so that, if Dual-Casted, puts a 30 second recast timer on it.

These two changes will reduce overall DPS while still keeping it viable, increasing burst damage and rewarding effective Corps-a-Corps combo usage and cooldown use, and making RDM utility lessened somewhat.