I don't use the flukers at all, you want the feeders to have access to a variety of fruits, greens, and veggies to ensure they are getting as much nutrient uptake as possible before you feed them off to the chameleon. If you search gutload you'll come up with plenty of threads on the topic with list of potential ingredients. I tend to use leftovers from my own cooking so its mostly carrots, orange slices, sweet potatoes, kale, romaine, strawberries, apple, occasional broccoli but I read somewhere that broccoli and spinach can block Calcium uptake pathways so don't use them much.
On the superworms yours like others said above can probably take the large no problem, I just would get mediums bc they will often reach large size by the time you finish feeding them off and you will know they've been fed good ingredients. I personally buy some feeders in bulk online and have a couple roach colonies going to avoid buying from local petco. For the last few orders I have been getting smaller feeders and raising them to size myself after seeing some other senior members advocating this technique, I like the extra control over what goes into my chams diet.
