It turns out I was wrong about the naming convention. It doesn’t really matter how they are named as long as the system knows how to access them. Juj answered my question and explained some of it here https://answers.unrealengine.com/questions/416588/html-build-packaging-broken-for-shipping-builds.html
As far as compression, it is a little larger than 4.10.4. project went from 28MB to 38MB in the switch. Not quite sure what you’re seeing though.