Highly doubtful that pharma-grade T would be overdosed!
Even then a slim chance, anyone would be hitting a peak TT 2000+ ng/dL on 90 mg T/week (30 mg split M/W/F) + 175IU hCG.
First off seeing as you are injecting 3X weekly (M/W/F) then blood work should always be done at true trough (lowest point) which would be Monday morning on such protocol.
Not 24 hrs post-injection.
When getting blood work done let alone comparing results it is critical that you always use the same lab/same assays (most accurate) and always test at the same time (true trough).
You would need to have had your FT tested using Equilibrium Dialysis or Ultrafiltration to know where it truly sits
You stated that in all of your previous blood test results your TT is in the high 800s ng/dL.
Are these readings also 24 hrs post-injection?
If you are always using the same lab/same assays and testing at the true trough or at least in your case if it was always 24 hrs post-injection then I would look into retesting.
Even then you should always be getting blood work done at the true trough!