I just recently started mining a bit at your pool, and I do have one question..

I understand the double geometric scoring system, and I love the idea of it...

I am curious, though, why my prop-diff is quite often negative.  I'm not starting and stopping the rig, so I'm hashing continuously.  Shouldn't I be at 0 or higher?  What would cause me to get paid less than my share (proportional) if I'm not 'hopping' or taking breaks in mining?

Enigma