Mistake...

[Bad Zebra]

1. With regard to the held ball...you ultimately got it right. The mechanics will improve in time. Don't beat yourself up over that.
2. what they said about the travel...if you called that, the time out/held ball thing is irrelevant.
3. The fact that it's gnawing at you is a good sign. Your desire to make the correct call is admirable. You'll get that play right next time.
4. As your confidence in your calls increase, you'll tell the coach to stuff it because a)he is biased because he's a coach and ...b) If he's at the table, he shouldn't be expressing his opinion.

Good luck the rest of the way.