There appears to be an error in sgminer.conf, can you copy + paste it here?
hjurcic - theres a file in the mining directory called sgminer.conf. Rename this file to sgminer.conf.bak, or the settings in this file will take precedence over your .bat file settings.
My 280X .bat file
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
sgminer.exe --algorithm Lyra2RE -o stratum+tcp://pool.verters.com:4444 -u xxxxxx -p xxxxxx -I 18 --gpu-fan 58 --gpu-threads 2 --gpu-powertune -20 --gpu-platform 0
820 KH/s with this one. I haven't tweaked it that much because I wanted it running right after the switch.