Finally got the shims in this last weekend. Man time flies.
Ended up going with 8 degree shims and as far as I can tell they fixed my issue.
I also added limit straps to the rear while I had it apart. Single shear mounts, mostly to protect my shocks in case I get a lil' too rowdy at any point in the future. It isn't a desert racer, so I don't see this as a problem. Has bump stops and limit straps on all 4 corners now.
For more pictures and details go here:
DIY Driveshaft Vibration Fix | DIY METAL FABRICATION .com