I feel like my experience with this pool is far different than some others. My payouts have been consistently under the announced btc/mh. For instance, I moved my 2.7 mhs to the pool around 24 hours ago. My account already had a balance of around .007 btc and my payout today was only .0175 btc. I am not experiencing a large amount of hw errors or rejects. Today was the biggest discrepancy between the announced payout and my payout but I have almost always been lower than expected. I am using the same settings as I do on dozens of other pools where I consistently get paid approximately what I expect to get paid. This is the first multi pool I've used and it has been very disappointing. I'm pretty sure I would make way more just mining LTC.
I too have never seemed to get even close to the expected results from this. I mined here with about 2.8mhs - 0.1 mhs reject rate for over half a day, maybe 13 hours but currently my exchanged+unexchanged estimate is only 0.006. Extrapolate generously and I only get 0.012btc/day with 2.8mhs of power or 0.004btc/mhs/day which is just totally far away from any decent estimate.
As with you, I do not have any HW errors or unusually high rejects. Same settings with all other pools which give me no problem.
I have tried clevermining and the expected payouts were very accurate, despite it being rather low in profitability now. I just can't put a finger to this pool. I love the stats but the results just dont tally.