Last night I read through the OpenCL manual and AMD optimization guides...

4x 280x  1020MHz GpuClock / 1499 Memclock
Catalyst 14.4 driver with 14.6 CL files in the sgminer folder
and a few modifications to that slow ass Nicehash neoscrypt.cl file
1440 Kh/s using 720Watts at the wall, undervolted at 1.025V

https://drive.google.com/file/d/0Bx2VQJcXD3ISdkJHNkZPS2lQUk0/view?usp=sharing

fastkdf is slow.  Byte alignment improves things.