Think of it like your car is a hand drill. with the shaft spinning one way, the rest of the car wants to spin the other way.
This puts more load on one side. and it pulls to the opposite side :P
You can stop this from happening by fiddleing with droop setting it different from side to side. i never quite mastered it myself but i know it can be done.
If your never accelerating from a standing start (or really slow corner) then id leave it all symetrical.