Do doctors adjust sleeve size based on patient needs? Can I request my sleeve to be larger than 2 oz.?

No, we try to standardize the size of the sleeve.Some surgeons use a 32 French bougie (rubber
tube used to size the sleeve), some use a 42F, I personally use a 38F, you get
good weight loss without too much post surgical nausea and vomiting.

If you follow the proper diet after surgery, you should not have an issue maintaining your nutrition. We make our sleeve as small as possible at time of surgery because we know the stomach will enlarge (dilate) over time.

Your sleeve does not stay the same size - and what it ends up being total changes over time. It will enlarge.  Your doctor should know best your size and know that it will increase. Use the small size initially to lose weight.