--CL 12 --RAS 28 --RCDRD 12 --RCDWR 5 --RC 44 --RP 10 --RRDS 3 --RRDL 3 --RTP 5 --FAW 20 --CWL 7 --WTRS 4 --WTRL 9 --WR 16 --WRRD 1 --RDWR 19 --REF 17550 --MRD 8 --MOD 15 --PD 8 --CKSRE 10 --CKSRX 10 --RFC 250
What memclk?
I got instacrash with this. Also you can try to lower FAW to even 12. After some discussion it seems lower FAW is better.
On my 6 card rig FAW 12 instant crash, but on my 5 card rig it's running good for the last 2 hours. 30 min avg. hashrate increased from 10641 H/s to 10720 H/s @ CNR. Less than 1% but its for free

Now more than 10% increase from stock values. 9600 H/s --> 10700 H/s. 11.46% for CNR which is not the most memory intensive algorithm.