Just to throw an alternate opinion out there...
When using Rapid Fire (RF), I don't like the 2.01 break point because I burn up hatred too fast. I prefer to stick with the 1.67 break and get my CC & CD higher. With that strategy, I'd suggest upgrade to a CC Mempo, better bow and better DML with bonus to RF.
Since you haven't stated a budget I'll assume it's unlimited. I'd upgrade to:
1. 2 socket Manti with 48%+ Weapon Damage, +11% ASI and 1300-1350 DPS for 2 bills
2. 5.0-5.5 CC Mempo for 2 bills
3. DML with +8% CC RF, 10 CC, 19%+ IAS, 300+ Dex, 290+ Vit for (not sure on price, but probably 1 bill or more.)
I believe the 19% DML & 11% Manti will set you up to get to the 1.67 break with another 18% ASI (which you can get on 2 items). That means you could switch out the 2 bills Mempo for an equally good Nat's Helm for way less. It also opens up a lot of other flexibility with gloves, rings, belt, and the pants/Lacuni's combo.
You can see I took a different route by reducing ASI on a lot of my items to get cheaper prices.
Also remember the extra ASI doesn't help for Rapid Fire, but it does help the other (hatred generating) skill. So, keeping more than 1.67 is not a total waste.
I agree with Nyan, that you should at least try swapping out a +7% CC RF, 28%+ IDAEs SOJ with the Hellfire and see how you like it. I also agree with crafting better bracers.
As far as skills, I like RF - Fire Support for high MPs and Bola - Thunderball for the stun effect. I think you're going to find your set-up is a little glassy for MP8 and above. If you are getting 1-shotted too much, try switching out Archery for Perfectionist.
Edited by DoubleD#1397 on 8/13/2013 3:29 PM PDT