I guess the only concern I have with offering articles to them unsolicited, is it will not be well-received.
Agreed. It may be difficult to approach someone you have not already had the opportunity to develop a working relationship with.
I really have no reason to believe that the school and the tester do not have the best intentions.
Sharing and discussing articles with those with whom we have established a working relationship does not cast aspersions on their intentions, neither does having things written in policy/practice statement so that all may be aware of the standard.
I am just a bit concerned about how this testing DOES actually sound like it can produce such different scores in the same child. That worries me.
Hoagies' Gifted Education Page provides some resources for interested parents to begin their research, including
Why Do My Child's Test Scores Vary From Test to Test? and
An Inventory of Tests