I'm currently running four WMLs and all are rock solid. You could do what I've been doing lately and glob on a little Vibra-Tite VC3 onto your pic rail, let it set until partially dry (somewhere between gummy bear and maple syrup consistency), then clamp your light down. It's not permanent. You can scrape it off easily if you decide to change it out later. I haven't done it with a light, but I've been doing this with the optics and irons on my rifles.. you know.. just in case.
Someone suggested shimming. That would probably work too.
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