Vibration after heavy leaf spring install

So I just installed ironman 4x4 heavy rated leaf springs ahead of the arrival of my decked system. Now im getting a vibration between 20-30mph. I understand some angles may be off and that could be the culprit but once I get the decked system installed will the extra weight correct the issue?

 

there's a good possibility the extra weight will improve the ride. i know my truck rides a lot better with a bunch of weight in the bed.

 

I had to install a 4 degree shim at rear axle to correct minor vibrations at about same speed. Running medium dobinsons leafs at 2” lift.

 

Rule of thumb is 1 degree per inch of lift for rear lift.

 

I'm running their medium duty pack with 3 degree shims. no vibrations, maybe try adding in some 3-4 degree shims.