So the consensus is just to overclock my way up?

Will that really make 160 mh/s of difference? Is it the miner I'm using or something in the os perhaps?
Yep, that newegg link's the one I have too

I just set up a XFX 6950 on ubuntu 12.04 with the proprietary drivers (from amd website), and have downloaded and configured poclbm.
Issue is looking at the hardware comparison, I should be getting ~300+ mh/s, yet I'm only getting 200mh/s. Not really sure what the problem is.
Any ideas?
flags used: -v -w 128 -f 1