This is your fundamental problem right here
You can’t generate collision for procedural meshes in a packaged game yet!
Epic still need support for this
Also the wiki was written by Dmacesic, I can’t take credit for that one 
See Dmacesic’s request to Epic about adding packaged game support for procedural meshes!
Your project cannot realistically continue in the manner of using procedural meshes for collision until this fundamental issue is addressed!
You could try using instanced static mesh actor but I am not sure about collision issues with that, wont be as fast as procedural mesh
Best to encourage Epic to implement procedural mesh collision support for packaged games!
I can’t continue with my UE4 Max (3ds max remade in UE4) until Epic does this!
Rama