Instead, just buff the other power weapons.
The fusion rifle actually feels powerful, and you can mow people down with it. That's how power weapons [i]should[/i] be.
Maybe grenade launchers get more blast radius, snipers get more body shot damage, shotguns get a little more range. The point is, make everything feel just as powerful.
Edit: However the amount of ammo that the fusion gets with enhanced battery is a bit excessive compared to what everything else gets, so possibly bring it down to four. But the stats are fine.
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Sniper damage is good, instead decrease the swap and aim down sights time. That would help a lot more then body damage because it is low impact sniper. Besides that I agree.