You may have the same issue i had. It maybe a buckled wheel rubbing on a ballends. You may not pick up on it when you're testing the diff action by hand, but when you rev the motor with a buckle wheel attached the wobble is amplified. It took me a few weeks to pick up on this because once I finish cleaning the car, I put on a set of setup wheels and finish setting the car up (new wheels and tires - unused). Hence why I never detected the problem at home as my new wheels are still straight, yet some of my old wheels are a little out of shape.
I use losi wheels on the rear less flex and more material around the pin area, plus the off set is nearly the same (0.5mm narrower in track width). AE wheels will reduce your rear track width by about 2mm and the wheels rub on the ballends even more.
I hope this helps.
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