Before I worried too much about the toe I would have to know how your tires are wearing and what the readings are.
The offset bushings can change the toe by about 5mm a side, BUT toe on the swingarm rear ends wasn't a matter-of-fact proposition. Most alignment equiptment won't give a rear toe spec for MB because MB doesn't. What they do give is a chart with the spec for toe at a certain camber. This is all changed by ride height.
If your rear toe is even side to side I wouldn't worry about it unless your tires are wearing poorly.
If one side has inappropriate toe then it is probably a bent control arm. They bend pretty easy if you go off road or airborne.