What Does IVA Score Determine About IQ While Being Diagnosed With Adult ADHD?

I m pretty sure I have adult ADHD, and most of the evaluative measures I ve been through point in that direction. In fact, I was diagnosed as ADHD (inattentive) last year, but I lost that provider and had to find a new one. Now my testing psychologist is relying on the results of the IVA+Plus continuous performance test to conclude that there is NOT good support for an ADHD diagnosis. I m 66 years old, a college graduate, with a Wechsler VCI score of 141 and a Processing Speed score of 102 (a disparity of about 2.6 SD, I think). My IVA scores were 93 (full-scale response control), 108 (full-scale attention scale), and 109 (combined attention). But I have several problems with these scores: 1) My IVA age group is 66-96, so I m being compared to people in their seventies, eighties & nineties -- and a fairly small sample of them at that; 2) I didn t think the test was all that boring -- for only about 15 minutes in a distraction-free environment. (Plus, my career occupation was technical editor and my current volunteer job is teaching English as a second language -- so I ve trained myself to handle certain kinds of boring tasks); 3) I ve read that patients with more education and higher IQ tend to do better on the ISA; and 4) I think I do slip into hyperfocus sometimes. I d very much like to get a second opinion on the wisdom of putting so much weight on one CPT. Thank you.