Good stuff golf. Sounds to me that you got it correct.
As for the next game, I would not say anything unless he brings it up.
Myself, I would say something like that although we were confident the situation was handled correctly, I decided to consult the rulebook [optional: and casebook,] anyways, because of the importance of the play. Both books back my P and I up and we got the call correct.
You could also say that you consulted your colleagues [us here at of.com] and everyones agrees [am I putting words in people's mouths?
] that the play was handled correctly.
Myself, I've got a pretty good rapore with the coaches in my region. I personally would comment that although I understand his need to work hard for his team, there is still the need to not act unsporting. (I feel that he was very close to acting unsporting and we have a channel to deal with that.) I wouldn't want to see your team lose because of preventable behavior.
That's my 2 cents.