Looked at your pool stats and I note that the payout does not tally with the mining calculator at etherscan.io
100 MHps is calculated to pay just over 5 ETH per day but your contributors seems to be achieving about 3+ ETH only.
Maybe I am interpreting it wrong...
Try it for 24h and report back - my calcs were/are based on etherscans source, I will check it again as soon as I have some time.