The Kaidomain reflector has a lip protruding around the lens side opening. It does not drop down far enough to press on the kaidomain centering ring, and does not drop down far enough to let the bezel screw all the way down. Fail.

I dont have a micrometer yet, so cant verify the OD of the KD reflector is larger than the ID of the V11r head, but that appears to be the case at this stage of my education.
I could have figured that out if I had put the stock reflector and the kaidomain reflector against each other, but it did not occur to me until I finished closing the light back up with the stock reflector and centering disc… which works well enough for Government Work… lol
and yes, I will happily destroy some parts to help the Team.
fwiw, pol77 posted above that the stock reflector is 18.1 mm and the kaidomain reflector spec is 18 mm, so I dont know what Im doing wrong… maybe there is interference not from the lip at the lens end, but one of the other contours further down the side of the reflector interfering with the ID of the V11r head as it tapers further down, closer to the LED… not sure.
Something, somewhere, is keeping the kaidomain reflector from dropping in… some meticulous grinding on the outside of the KD reflector may be in order. It might help to have some carbon paper to figure out where the contact point is, that is preventing the reflector from dropping all the way down to contact the MCPCB, and preventing the bezel from screwing tight.
Yes the MCPCB could be raised, with thermal tape or thin copper sheet, but that wont solve the bezel not closing…
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unrelated to reflectors, but related to V11r lumen range

this light has an extremely low Low of 0.01 lumens, and it was not modified to achieve that. The high mode is also lower than spec. Both those statements are true even with the stock LED.
I suspect that the position of the magnets, note they are not centered in the slots, provided the shift in brightness. I happen to Love the lower Low… It is possible I could regain the stock High mode by repositioning one of the magnets… not sure which one though 
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I think those two lights use different LEDs, and I suspect different reflectors and centering devices…
let me know if I labeled incorrectly, the V10r Ti reflector, and V10r Ti+ Gasket, you posted
the gasket in my V11r does look like the one you posted, that I labeled V10r Ti+, it has the same lip, that faces down towards the LED, and the same tapered indent, that receives the V11r reflector for XM-L2, properly. (forgot to take a photo of the V11r reflector…)