We actually spent time in the visit trying to locate a low density diet available commercially with no luck. I mentioned that the resources here might have some suggestions, and he agreed it would be a great place to look for info. I'm hoping someone here has specific knowledge of either a commercially available diet, a recipe I can make, or perhaps some mix-and-match that has worked for them. Reading the knowledge is the posts from the community makes me believe that you guys pretty much have all the answersGlad you were able to find a vet.
It would be best to re-consult them and have them clarify the diet that they recommended.