Wow!!! Sounds like a fantastic day.
I always wanted to play with one of the guys on the PGA Tour just one time just to see how my very best shots really stack up against the ones they hit all the time.
I like your description of what he looked like when he really tried to hit the ball farther. Reminded me of Freddy Couples in one of those Playing Lessons From the Pros things I saw when first started playing golf. Freddy said "I'm going to hit this one as hard as I can". When he made what looked like his normal swing he said "That's as hard as I can hit one".
I thought to myself, Hell Freddy, you didn't even come out of your shoes like I always do. Ha ha! (Of course he hit it well over 300 yards).
I didn't understand at the time that "as hard as I can" to him meant "as hard as I can" (while still using an actual golf swing).