I think you're expecting too much from the testing, BDad. It's a tool, not a way of summing up your whole child.
You have a very special, deep, interesting child there, and you're 100% right that no piece of paper or group of questions is going to capture all of that. So don't expect them to. Lower your expectations. (BTW, people here told me the same thing when I was considering testing. It was good advice!

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The nice thing about testing is you can take what you need from the results and let go of anything that seems anomalous. Testing is one piece of the puzzle that is your child, but it's not the whole puzzle. You are the expert! Testing is just one more thing to help you make sense of it all.