Better quality effect for spiral volley

Spiral Volley has a really bad quality effect of adding 1 projectile every 5%, totaling 4 at 20%. This is on a skill that already fires 25 projectiles with a little auto-targeting, so it seems pretty pointless.

Because the skill consumes frenzy charges to increase damage, that's where the majority, if not all, of its damage comes from. So could the quality effect be changed to % chance not to consume frenzy charges? This would make it much more viable and similar to other charge skills, such as Flicker Strike which already benefits from this same effect.