piaa_ump
I agree completely.
You have said this on various occassions, the skill level of the ump will determine what is called a balk. If an ump can't explain it, then he will not call it.
When my son was pitching in high school he had a way to slightly moving his heel. The only time it was called a balk in 4 years is when the base ump was also a college ump.
They both laughed about it after it was called.