Something I overlooked earlier, but the phosphor covers the entire top surface of the square substrate (not just the circle under the dome). Forgot about that as most of mine end up with the silicone scraped off the corners, it's really fragile and easily damaged so most times I just clean it off before even starting. :)
I wonder if all that phosphor surrounding the emitting portion can be relocated over the emitter portion. Also, the phosphor remaining on the dome.