I want do to cranck up all four cores but the darn stock cooler isn't exactly helping here. Will try to show better results when the cpu is under water.

Saying it's a good/average/bad overclock because it's only one core should have sounded more friendly instead of comparing it to your own results, just to make it look even worse.
We're not all having finger chopping delta's and cpu's in the mail daily you know?