Weird shading after extrude, tried everything (i think) I am trying to exctrude some faces and after I do it I am getting really weird shading. I have tried:

-splitting nonplanar faces
-removing doubles
-increased vertices

Is there anything else I can try? Anyone know what causes this?
Add an Edge Split modifier. Ideally, you would redo/alter all the letters to have no more that 4 vertices per face.