About the white Flat in the SMO/OP L6 reflector: I have done a few initial experiments a few years ago that show that throw difference between a SMO reflector and a OP reflector is highly dependent on the size of the die: you tested it with smallest die possible, while Sofirn tested it with about the largest die possible.
See the few tests that I did in my (unfinished/abandoned) reflector thread: Ongoing project: reflector testing