Tried the config you sent, one GPU is fine but about the same hashrate (215KHs), the other GPU doesn't like it for some reason. Both are the same brand.
Please disable in AMD-CCC grafic-overdrive.The GPU-core depends on the vendor of your hardware: i'm using a r9 280x from powercolor(a cheap vendor) and have a GPU-core of 970 with 330kh/s.
On Sapphire cards i'm using a gpu-core of 1050 with 350kh/s.
diff of 20kh/s => at atm price ~ 22$ per yeah diff
but costs me 50 bucks less when buying new => 2 years ROI 
I can check when I get home.
About the AMD-CCC thingy, how/where does one disable this (and re-enable if it doesn't help)?