Great build and one I'm playing around with for a little bit of fun. I do though have a question, or more likely an observation on the DB+FR combo. I play on PS3 so this could be the issue, but when I hit the combo and DB takes out the first mob, FR doesn't fire and continue with it's wonderful attacks on the rest of the surrounding mobs. However, if I miss with the DB, or don't do enough dam to kill out right, then FR fires. so I've got my DB+FR combo, plus I also have FR ready to go if it doesn't fire.
I'm just curious whether this is across all versions, or unique to console.