I'm trying to figure out best settings for scrypt-jane MRC, with GTX 680.
So far I've got about 330 kh/s with:
cudaminer.exe --algo=scrypt-jane:MRC -i 0 -H 2 -l K8x32
Is 330 low, average or high for MRC?

I'm especially interested in the use of -s and -b commands. What should I base these values on?

Also I'm interested how much the N-value effects the hashrate. The readme mentions low-count kernels instead of high (e.g. "k" instead of "K") for high N-values, but are there any means to increase hashrate for low N-value?