Hi,
I am not an expert, but since your psychologist isn't explaining this to you, I wanted to share that for the two 19s, it might be helpful for you to ask what the raw scores were. 19 is the 'ceiling' for the standard scores, so in some cases a kid can get a really high raw score but it is still reported as a 19. If you get the raw scores, you can convert those via the WISC extended norms guidance (not sure where the link is, but you can Google it or probably search the archives here). Also, I think it is valid (please could somebody who knows confirm this?) to calculate the GAI using the extended norms, so your kid's GAI (and FSIQ) could be higher than the values you got here.
Also, in our experience, it is well worth finding and working with a psychologist who specializes in gifted and 2e kids, because otherwise you can get somebody who kind of glosses over the gifted part and just focuses on the behavior problems from the '2nd e' so you get a bunch of diagnoses that may not be correct and might cause significant trouble for trying to get into a new school in the future. In addition to the James Webb Misdiagnosis book, there are articles about 2e kids and distinguishing 2e from normal gifted on the Davidson site that are quite informative.
Best wishes,
Dbat