All sounds ok to me Bob.

I had a similar problem a while back. I ended pulling the car apart and re-assembling it. And then it worked.

No I don't know why. Some cars just don't want to work for some reason. And with that one once I'd rebuilt it, it was fine.

Toe-out on the front will actually make the thing more nervous. In my experience its usually the servo saver, the servo, or the linkages/balls although you seem to have eliminated most of them.
Dare you try another radio?