I know you said everything mechanically is fine, I had a problem just like yours on a different car. I traced it back to the rear axles shimmed too well!
With no wheels on, the car was freewheeling well. With wheels on and nuts done up tight, the car was essentially apply drag brake and causing the over rotation.
These days, and I do this to all cars now even if it can become time consuming. Remove the pinion, wheels ON and TIGHTENED, and see if there is any binding.
anyway, just a solution to a problem which may help some one out there if not yourself.
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