I think you are well on your way. If he is complaining that it is summer, you have a few options -
1) ask him what he thinks would show "his self" best
2) wait a week before taping the college texts
or
3) tape him discussing the news with Grandfather, and leave it at that.
You are very close to having "enough" and they will ask for more if they need it.
BTW - good for him for not wanting to 'cheat' and good for you for respecting his perspective. I think it is probably more convinsing if it is obvious that he didn't rehearse.
Best Wishes,
Trinity
