As a USAF Senior NCO, who is going through his own weight issues. My medical conditions impact my weight, but I could still have a better diet and personal management. My conditions contribute to but are not the CAUSE of my weight gain. There is a difference and I maintain standards, on the low end but still maintain standards even though it is made difficult by my medical problems.
To add the Air Force uniform wear and fitness regulations also add a bit of a catch all, they both state that the intent is to present a proper military image: cleanliness, orderliness and fitness. Both regulations also stipulate the commander has the duty to correct issues, even if the Airman is within fitness standards, to maintain a professional military image. This means that even if an Airman passes all portions of their fit test, if the Airman is still too large to portray a professional image (has to unbutton the blouse, to big to fit in untailored uniforms etc) the commander has a duty to help the Airman correct their image.
That being said, the power is usually in the unit commander's hands to maintain his units fit form and function
(rarely the commander over exerts their power of command)
. If the commander is over exerting power, then it should be evident in multiple cases.
Sorry this is another strong worded post, but it is the truth. In order to maintain discipline we have to adhere to our command until proven otherwise. If this is the case than I hope you find others who can strengthen your case that you are being unduly singled out, if not than I hope you can accomplish your goals you have set for yourself!