I hope I have some suggestions. We're in a similar situation. I've got an appointment for my difficult child in April. I'm going to bring his psychiatric and education evaluations, which show that he is 1) good at memorizing facts and 2) not good at overall comprehension, 3) 2 gr levels ahead at politics and social info (go figure!), but 4) 3 gr levels behind at manual dexterity, etc. I will also 5)bring along tests from Sylvan, that show how he has caught up and where he is still lacking. I will also 6) bring along a copy of the ltr from the psychiatric that suggests to the pediatrician that we try medications for his ADHD symptoms. I will bring along a copy of the neurofeeback test that shows difficult child is only using his frontal lobes and the right half of his brain (based on electrical output). I will also have some sort of documentation about his rages, which match the rage cycles in several of the Asperberger's books I have. I will also interview with-the neuropsychologist and tell him about the meltdowns in loud places, such as the Rainforest Cafe'.
Quite frankly, a lot of the interview is just that--an interview.
If I really want to, I can paint the neuropsychologist into a corner... but that's not what I want to do. I want to provide him with-info that will help him discern whether my difficult child really has Asperberger's. It's going to be very difficult because we've worked so hard with-him, and he's made so much progress.
Some days I want the diag and some days I don't.
I hope that helps.