We pushed an update last night that resolved the issue that justme27 reported. If you got a string of quick shares and VARDIFF pushed you up a tier, it would never let you back down. We can also consider lowering the target share time to 20 if people still think that's a problem.

Please keep up the feedback, it really helps us improve the pool!

With last night's update we also added some more secret sauce that should improve profitability. We'll also be adding two more coins later today.

Happy mining!