Wellp, I'm no expert in this but, according to this advice from master djozz, should I file the gasket as low as possible? I think someone said somewhere he was sitting the reflector right over the led board for White Flats, using polyimide film for insulating purposes. I also have polyimide film but I'd prefer to leave some centering stuff for peace of mind in case some muggle unscrews the bezel and loosens the reflector.
I don't even know how to make a photograph of the beam right now, that would help doesn't it? This stuff:
Do I need to generate some good deal of smoke to attain this? 
:-)