Granted, your DH is a pretty big guy, but these are some very large portion sizes. I know that Atkins says that you don't have to count calories, but he also makes it clear in his book that calories do matter to a certain extent and that the metabolic advantage is not to be used as an excuse to gorge on low carb foods. Does he really need this much food to feel satisfied but not stuffed? Ask him to think about how much he really needs at a meal and to think about eating just until he is no longer hungry instead of eating until he feels completely full. It also seems that he is pretty heavy on the protein, but light on the fat (Atkins is actually a high fat diet, not a high protein one). Increasing the amount of fat will also help him feel more satisfied with smaller portions and keep him from feeling hungry between meals.
Try cutting back on the protein portions and increasing the fat along with more veggies (put butter on the veggies, cook those eggs and meats in butter or olive oil).
I know that guys typically don't think about water retention, but eating an entire large bag of pork rinds is giving him very large doses of sodium which for sure is making him retain water. He may think that drinking extra water isn't going to make much of a difference, but if he's taking in that much sodium, it's necessary.