Hate to be the necrohippoflogaphiliac here, but I'm still getting really high rejects (even after the tweaks you did), also my hashrate is all over the place when I know my CGRemote is showing a cool 2.0 MHash.

Please take a look http://www.clevermining.com/users/1M6ZozLvZoRhD6NLhtfcVB2aWcgtZhUG8w\

Ideas?  This is a rig I've mined with for months, and I've never had a high reject rate like this.