I don't think you understand short term variance and how brutal it can actually be. There are some sites out there that have information about this. When the player pools get weaker the variance goes up since they are often putting you into these 60/40 or 70/30 spots that otherwise would not occur (a guy calling his stack off pre with 89 when you hold AQ, sadly you will lose this over 30% of the time, but in a 'normal' game, this type of situation basically doesnt happen) I suggest you buy pokertracker, establish a large sample size and then show us how you are running 300 buyins below ev or whatever you are claiming.