I just got
another servo to try. I've installed it and hope to try it out this weekend. I'll let you know the results.
FYI-I've opened a case with Hitec Support, and they advised me to send the servo in, which I plan to do if my test servo solves the problem.
My steering is not binding, it moves freely.
If we assume my ESC is sending plenty of juice, do you have any other guesses?