I don't believe that thread is advocating for adding more carbs. Instead as i read it, the recommendation is to make sure to be looking at calories, protein, and fat - not just carbs when choosing a food to ensure that the cat is getting sufficient calories, and not just obsess about the carb level. Many cats do fine up to 10% carbs, while some folks in an effort to control BG will only feed their cats 0% foods. Sometimes 0% carbs is also a lot of water and fat, and not much protein which can contribute to being under nourished. Hills MD is 13%, so I would be cautious if you decide to introduce that into her diet. That being said, I know you are somewhat limited in food choices, so whatever you have to do can be dosed around.
I agree with Kris that if you don't start seeing some movement in the next cycle or two, your next increase can safely go up by 0.5u. Goma was making some good progress, and she'll get back to it. But it is oh-so-frustrating when a kitty gets stuck like this. Hang in there! Sending healthy vines to little Goma!