Well I have set custom colors (they are gorgeous, the blacks are so rich and the other colors are so deep) to change at boot and changed my kernel.
Now without a doubt the battery is better. I am reporting 1% lost ever 5-8 minutes as opposed to 1% lost ever 1-3 minutes. With data on for both tests. Of course I only just changed kernels and what not. So my new found success could just be me being overly excited.
I'll run my phone through a full day of my 'normal' use. Then we'll see just how much more amazing Matrix is
Nexus S (GSM i9020a)
Matrix Kernel (CFS 19.0)
OC 1000/200 (Lionheart)
Deep Idle (Off - Noop)