I will simply point you in the direction of this thread:
For those of you on thyroid medication
Read everything you can by Chrisgj2 in the link above.
The cortisol range (2-22) is was determined using sick people. With that in mind, ACTH Stim range is also flawed. If you are in the range above, you probably have adrenal insufficiency. Healthy cortisol numbers for men are upper 20's to around 30 for the 8am number.