[Demon Hunter] - Bow, Crossbow or Two Hand crossbows?

Hi all,

I used to use a crossbow, 865 DPS, 200 dex 100 vit. I recently switched to two hand crossbows each with over 750 DPS, over 200dex and over a 100vit.

Sorry about the guestimations, I'm at work and I can't remember the exact figures.

Anyways, since I've switched over, I've enjoyed the increase in attack speed from the two weapons, but it doesn't feel like I'm doing more damage.

Also, switched to two weapons with a combined total "base" DPS of over 1k doesn't feel like it made as big of a difference as I thought it would? Damage only went up about 2k? How do these mechanics work? I currently do about 62k with SS :/

What do you guys use?

I have just over 1mil in gold to get my damage up even more, suggest replacing these or other items?