This build looks pretty solid, good job.
The only problem I'm having is that I can not set the GPU engine clock on my Sapphire Dual-X cards when using Catalyst 14.6
With the Vapor-X cards it works fine.
It's probably an issue with the new beta drivers but just wanted to mention it in case it's something in SGminer.
EDIT: Just tested with afterburner and that can change the clocks on the Dual-X cards under 14.6 so maybe not a driver issue ?
I've heard a few people mention something like that but it seems random or based on card models. It's not something that I've experienced myself with my Dual-X's. Try reverting back to 14.4 or 13.12 drivers.
Then, copy the following files from the 14.6 beta drivers into your sgminer folder: amd_opencl32.dll, amd_opencl64.dll, amdocl.dll and amdocl64.dll. You will be able to get 14.6beta speeds without actually installing the drivers and messing your system up.