Ohhh this pool is so fishy. My hash-rate shown there is about half of what I'm actually hashing (6000kh/s instead of 9600kh/s). Also the payout I have in the last 8 hours is equivalent to 3.11 LTC (I took unconfirmed balances into account), while I should be getting 12LTC/day at my speeds. So there's 3 LTC short, even though this pool mines at equal to or greater than LTC profitability.

Yes they're skimming my shares, that's for sure. Must be that "time based PPLNS".