Right now my dual crossbows beat out my bow + quiver by about 10% damage. My bow rolled pretty low on damage though, so it's quite possible that a better-rolled Bow will fix that for me. I hope so. I do like the dual 1H'ers, though. One of them constantly spawns caltrops and sentries for me; the other leaves a clone of me when I vault, which enemies constantly attack thinking it's me.
Only thing I don't like the dual 1H setup for is if I'm using a non-channeling Hate spender. If I'm using Rapid Fire it's fine because of how the cost reduction kicks in for that. But for other abilities like the thrown dagger, you run out of Hate quick.
How high is your CC? I salvaged my Helltrapper recently but I think it was low dps anyway with a bad roll. I have a really nice Tenclip and a decent Dawn so I might test this out. Honestly I think this would be great with the nat bow considering the +CC you can get using it. Nat bow + Calamity might be amazing.