Pinion shims or carrier drop with AP standards?

Anybody running pinion shims or carrier bearing drop with AP standard leaf packs? Just working on getting rid of a very subtle vibe at 5-10 mph. Someone else hear recommended a drive shaft spacer too, any opinions on this is appreciated!

 

Im currently shimming my carrier bearing with washers and longer bolts i got from auto zone to try to get ride of some vibs i have at around 35 i have around 2" of washers on it and its smoothed it out some. hope this helps man

 

ive tried both with the expo pack.. could not get rid of that take off shudder..

 

The take off shudder is the rubber slop in the metal housing. A solid mount would stop that