Good luck, and I haven't read through the thread yet, but I have some questions.
I am going to be a Registered Dietitian in a couple years (grad school/internship is all I have left) and I have a few comments/suggestions
1. What is the Vitamin D for? It aids in bone health and immunity, but has no weight loss benefits. Is that your reasoning for taking it? It is very easy to get Vitamin D, and can obtain enough for a day in 15-20 minutes of unprotected outdoor presence.
2. Doubtful your weight issues are genetic as you are not overly heavy. You have less than 100lb to lose, which isn't that bad at all. Your problem is most likely metabolism, but this is more affected by lifestyle than genetics though commonly perceived otherwise.
(EDIT: I see you have calculated your metabolism as 3200. This is unlikely, as you are having weight gain issues. Your metabolism has a potential of this amount, but is probably hindered because of lifestyle choices made previously - which can take up to a year to correct themselves - and probably a tiny bit of genetics)
3. Do you eat breakfast?
(EDIT: I see you are. Good. I would aim for about 300 calories for breakfast normally, but you are having a midmorning snack too, which works just as well if not better.)
4. Are you taking supplements?
(EDIT: I see you are taking protein supplements. There is a common misconception about these, and I recommend drinking skim chocolate milk instead. It has many more benefits and most people do not need protein supplementation, even when building muscle, plus contains a carb/protein ratio that has been researched to be desirable for post workout needs. You shouldn't wait so long to have protein after a workout, you need it within the first hour for benefits. You don't want to take in more than 1.2g protein per kg of body weight, so for you this means no more than ~150g per day. Upon further reading, you may still be in this limit, so its just a guidance number at this point)
5. How many calories are you consuming a day and what is your typical day like activity wise?
(EDIT: I see you have cut back to 2000 calories a day. This is most likely good, without further analysis)
I'm here to help, so fire away
PS - you say you can't lose weight without exercise. Good for you, for acknowledging that a lifestyle change is imminent if one wants to lose weight. It's not just you, or your genetics either. This is true for most people, so don't feel singled out!
just strength train. you'll stay around the same weight but the muscle will replace a small part of the fat. then drop the cals to cut the fat. much better than loosing then gaining. waste of time. you have a size advantage at 6'1 @279lbs than if you where at 210lbs. use it! 
it works and can be a healthy way of doing it if you eat healthy. just another option of doing it
