wildboy you still watching this thread? Make sure you guiminer is updated. The newest one comes with a new phoenix, and with that comes a new phatk kernel. You had these arguments.
-k phatk VECTORS BFI_INT AGGRESSION=8 FASTLOOP=false WORKSIZE=256
-k phatk2 VECTORS AGGRESSION=8
Switches to the new phatk 2.2 kernel. BFI_INT is on by default now, WORKSIZE defaults to the largest your hardware can do (256), and FASTLOOP is off by default as well.
Thanks, i have the current version of guiminer, and i changed the arguments and it seemed to work a little smoother (was jumping back and forth from 298 mhash to 303 mhash, but now it stays between 302-303).