Pointing ALL my hash power at UTC right now, only getting 70-75KH/s per 280x, but they are also pulling a LOT less power than normal scrypt and it's helping out the cause, still not sold any of my mined coins, hoarding them all up

about 85kh/s on my 7970 @ 1250/1850 clock speeds.
You should be getting at least 110 KH/s with each 280x/7970. (Over 130KH/s if you have 8GB of RAM or more)
http://www.reddit.com/r/official_utc/comments/1z93t9/cgminer_configs_for_new_nfactor/Still can't get above 75, even with those settings

perhaps download afterburner and set your power limits to max. your card may be holding back with lower power limit.
Have set GPU powertune to 20, I am using MSi 280x, thought they were supposed to be alright, I also have another rig with 3 VTX3D 280's and a normal desktop with an XFX DD, none of them top out over 75 though.
**EDIT**
And they all go tits up if I use -G 2, trying some different TC's with it now though, but currently really low WU and many, many HW errors
