Playing a similar build that swaps the UAC20 for a UAC10 more ammo and an extra DHS and I've been kicking some pretty serious ass. So far I've had 2, 750 damage games with 4 kills in each and I'm still leveling for basics.
Interesting I'll have to give that a whirl. I played this for a few matches last night and I don't know that I was that satisfied with it. I might try and flip from a C-U/AC20 to a straight up C-AC/20. I don't feel like I was getting the mileage out of the Ultra that I had hoped.