Sounds like you need to roll the pinion yoke towards the ground. Best way to do it is to put the truck on a drive on lift. Also ramps in the back and jack up the front of the truck to get the frame level will work too.
Make sure you get the shims that allow for a longer leaf pack bolt so you can install the bolt through the shim and leaf pack that way your rear end is centered.

Also you can try clamping the over load leaf to the rest of the leaf pack to roll the pinion yoke downward.

 

Alright so i got my shims and i am about to put them this weekend. the question i have now is the center pin bolt that comes with the belltech shims is what do i do with them. and the shims have a slit all the way to center then it has a extra hole. what do i need to do with the placement of the shim when i put in

 

Post pics of the shims.
The new bolts are longer and allow the bolt to hold the shim so your rear end centers on the leaf packs