@GenTarkin For me mine_slush works nice in the default scheduler, dunno if it matters but I played with penalty too (1-4)
Personally I think mine_slush should be removed and replaced by penalty, it's more dynamic and can account for say a 100ghash pool that delays stats by 1 hour (still hoppable). While a pool that delays stats for 1 hour > 1Thash/s, it's impossible to know where they are....
Or for smaller/slower pools, I put in a penalty so I don't mine too much on them, since payouts take forever...