@kano - thinking of joining your pool.  I know your luck has been down lately and its most likely normal.  However, I wanted to tell you something you probably already know... but just in case... i compared the block size of your last 150 blocks to Slush's last 150 blocks.  That's probably not enough of a sample size, but wanted to let you know your avg block size is 5% below Slushs.  Your code is not filtering any blocks out by size, is it?  I apologize if this has been brought up before.  I'm not trying to stir up any issues... I just know that this same issue existed with Slush awhile back, and they were filtering out blocks by accident.  Slush has since corrected the issue.