So you've seen two dumb dolts who are looking straight at abnormal labs and completely dismissing them with a variety of inane non-explanations?
I've never seen a TSI result exactly like that one. There is usually a result of a percentage and a lab reference range to compare it with. The "< 89%" would be the range, but it doesn't indicate what your actual result was. Say your result was 88% or 50% or even 20%... None of those would be considered "normal" just because they're less than 89%. Any
titer of TSI is not normal. If a positive titer of TSI were coupled with a positive titer of TPO, they tend to cancel each other out, keeping T4/3 levels within range until one antibody wins out over the other.
And BTW... TPO of nearly 900 always means something. (My gosh... Did these guys get their degrees from a Cracker Jack box?)
Most insurers have an appeals process for going over a GP's head to get a specialist consultation. Can you investigate doing that?