How often did you clean the soft chami? If you're like 80% of the people I know, they use the little bag or a lens cloth to clean lenses, but NEVER EVER think to clean the cloth that cleans the lenses. All these things are a micro-fiber. Micro-fiber picks up everything on the lenses and holds it. After using it for a while, you're just wiping (grinding, sanding, scratching) all that stuff in the cloth back on to the surface of that lense.
BTW - "plutonite" = polycarbonate. It's nothing special. Polycarbonate is the softest lens material out there, and is therefore very easily scratched, although some do have scratch-resistant coatings, which cannot be applied over the top of any other coating. With that said, it is VERY impact resistant (try to snap a poly lens), and is used in sporting eyewear for that reason - it's virtually shatterproof. The rest is just marketing hype. The more flexible the lens, the more likely it is to scratch, so ski goggles are very susceptable.
FWIW, I worked in the optical industry for 6 years, and about 3 of those were in a lab. I've got a little experience to back up what I'm saying.