There are still ~50 mh/s that is quite stable in the network that keep on mining throughout the high diffs. The diff jumps fast every time the big hit 'n run miners comes in on low diff. Suggestions on how to effectively deal with these hit 'n run miners would be greatly appreciated as they do mess things up for the users (transactions) and somewhat for other miners.
As for the good news, it only stays high for a couple of blocks (2-4). This rapid diff adjustment behavior almost completely eliminates the possibilities of performing successful 51% attacks.