Regarding the meeting, which upon reflection was possibly a bit unsatisfying...
1. After a meeting it is common to write an email letter of understanding. For example, you might thank them for their time, list any areas of agreement, and then list areas for follow-up (such as receiving data for the assessments, etc). You might still do this, in regard to your recent meeting.
2. For future, prior to a meeting it is common to suggest topics for the agenda. This may help ensure the likelihood of covering the issues and receiving the data that you are anticipating.
3. During a meeting, it may be wise to take notes, including each person at the meeting (name and title) and each topic as it is covered.
4. You may wish to keep all your notes and copies of your emails together in a ring binder, arranged chronologically by year.

The old thread at this link contains a round-up of crowd-sourced tips for advocacy: http://giftedissues.davidsongifted....y_Advocacy_as_a_Non_Newt.html#Post183916

Regarding behavior and impulse control, the information at Understood.org and Wrightslaw may be of interest:
1. https://www.understood.org/ (you might query or search for "executive function" - - https://www.understood.org/en/search-results?query=executive+function)
2. https://www.wrightslaw.com/ (scroll down and look for the topic "Behavior and Discipline" in the list on the left - - https://www.wrightslaw.com/info/discipl.index.htm)