Ima gonna say this about that. First of all, any spray coating is gonna wear, one way or another. That being said, your app might have been a little flawed. Or you might have been a little heavy-handed in the re-assembly. Hard to diagnose form the internet, although we sure do try.
While I believe that Cerakote is usually a superior product, as far as durability goes, I use Duracoat simply because it doesn't require "professional grade" application to get the most out of it. And for me, in a home workshop setting, it makes the best coating when you consider the ease of application, good durability, and ease of touch-up.
So if I lived within spittin' distance of 'ol Steve, I'd be over there on Fridays, with a case of beer, and buying up more Duracoat. Just cuz.
Maybe you're feeling a little under-whelmed here because of all the hype that can surround a subject; I didn't think any of that stuff surpassed what I'd call normal wear n tear. Looks like a bang-up good job to me. Although I get it; you paid a lot of bucks for it, and you're like WTF when you see some wear. And polymer can be tough row to hoe, that's why Steve has an additive for it. That's the largest wear area I saw, and is prone to doing that. I use a lot of lube to re-assemble things, and the additive helps make the coating more flexible on plastics.