Driveline Vibrations under 30mph?

Hi all,
I am having vibrations between 15-25 mph after installing my lift and was wondering if you guys might be able to help me fix the issue. I just installed bilstein 5100s in the front and dakar leaf packs with extended bilsteins in the rear. I also installed the ECGS bushing and carrier bearing spacer so that should not be the issue.
I have heard people use shims to help with the pinion angle which I believe is supposed to help with some vibration. Is there anything else I should try in addition to shims? Also what degree would you guys recommend? Thanks in advance.

 

1 degree for every inch of lift is recommended.

 

Agreed, you'll want the 3* shims. I have the exact same setup and my issue has gone away since installing these. I do need to get around to doing the ECGS bushing though

http://www.headstrongoffroad.com/store/p119/Axle_Shims_-_(2_degree_to_4_degree).html

 

Thank you guys for the help! Ordered my shims today