Like I said to you before, he's healthy for now. If the opinions of two vets are the only sources you're using, then I say you need to research some more. So far the only literature I've found that supports all-rodent diets are caresheets from Petco. And we all know Petco is at the top of their game in the industry. Yessiree.
You've obviously made up your mind to kill your animal as slowly as possible, so I doubt there's anything else I can say to affect what little mind you have. But I'll repeat myself just because I care about reptiles that much.
I never said not to feed your sav mice at all (or wild insects, either), but I think 4 a week is too often. In the anapsid.org sites I posted (which I doubt you even bothered to click on since you know everything on savs), Mr Balsai pretty much says that savs do not have a mammalian metabolism, but most keepers feed them like they do. Overfeeding has always been an issue with this species, no matter what goes in their mouth. Know why? Because many times out of the year, the environment savs live in may experience droughts or floods that may last months at a time, making food scarce. So a sav's natural inclination is too gorge itself when the meals are there, because it may not find a meal for another few weeks. They exhibit this same behavior in captivity, but their owners simply mistake this for mere hunger and end up them feeding them more often than they should (people do this with fish, too). Thus, there are a lot of obese savs nowadays. And now, people think that an obese sav is a healthy sav, which it most certainly isn't.
I don't type out these lectures to act like a know-it-all or just argue for arguments' sake. I say all this becuase I care about animals, passionate about their well-being, and I know you, JeffLeMay, are wrong. It infruriates me that people like you totally do whatever the heck you want to your animals because that's what people thought 20 yrs ago. Guess what? Times have changed and we know a lot more about savs diet than we did then. But learning that new info requires too much work...like reading. It infruriates me even more that its not you that will suffer in the long run for your stupidity, but its your pet.
Whatever dude, its your pet though. At least consider taking it out back and shooting it in the head. Probably a more quicker and less agonizing death than wasting away in fatty tissue and liver/kidney failure.