im getting weird results atm

when i use the following config (stock one that comes with the miner:
EthDcrMiner64.exe -epool us1.ethpool.org:3333 -ewal 0xD69af2A796A737A103F12d2f0BCC563a13900E6F -epsw x -dpool stratum+tcp://dcr.suprnova.cc:3252 -dwal Redhex.my -dpsw x

i get 29mhs on all cards with eth n proper mhs with dec (cant remember what it was from my head)

when i use the following config:
setx GPU_FORCE_64BIT_PTR 0
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_SINGLE_ALLOC_PERCENT 100
EthDcrMiner64.exe -dcoin sc -allpools 1 -epool My Pool -ewal My wallet -epsw x -dpool siapool -dwal siawallet

the hash rate drops to 23mhs and as does the sia hashrate and im confused as to why

if i mine eth alone hashrate is good, even when i try my own dec wallet it does the same thing?  am i missing something??