any good settings for 6950 with this new x11 miner?

I cannot get them not even 30% more from the normal sgminer.
My r9 280x went 40% up.
Anyone got 6950's ??
-w 128 is the key, went from 1.5 to 1.81 at 945/1300 (shaders locked at 1408)
dont try to set a thread concurrency.