my first impression, is that power supplies should not cause that much noise..
but after looking at your build log, and realizing that your using the m4, it is possible (did you see the thread on noisy power supplies?)
but i am a little confused on how your setup came together-- are you still using everything in a in-dash setup, or have you now relocated everything to the glove box, and spread out the components?
with the way your setup last pictured setup goes together, it should be pretty easy to separate the m4 from the other components to test that theory..
i should also note that grounding the rca cables doesn't always work-- in my install, when i tested it, it made GL noise worse..