The following settings is for my 7950 and gives me 295kh with scrypt-jane (MRC).
--Nfmin 4 --Nfmax 30 --StartT 1389028879 --queue 0 --scan-time 2 --expiry 4 --no-submit-stale -g 2 --thread-concurrency 8192 --gpu-memclock 1150 --gpu-engine 950 --intensity 12
Thanks for that. The -g 2 flag seemed to make the biggest difference.
Only getting 200Kh/s on each card, but the utility rate is up to 7/m from 0.4/m, so i'll leave it for a while and see how it goes.
Thanks again.