Put some O-rings in the dog bone cups.
 

I know this is an old thread but I've had this problem as well and I solved it after a month of trial and error...
The wandering is caused by your axles moving in and out on their bearings about 2 mm.
It's because you have no o-rings in your dog bone cups.
Grab a set of those little orange shock o-rings.
Mine started doing this after all of the o-rings in my dog bone cups disappeared due to hard driving.
I just put one in each cup and replace the ones in the center drive shaft that were missing.
MY WANDERING PROBLEM IS NOW SOLVED.