Quoted:
You're correct, it does have a lot of adjustment. I have it on it's smallest setting and I'm 6'4" and 210lbs. I would assume it would fit you. If you buy it from Atlantic, if it doesn't fit I'm sure they would take it back for you without hassle.
Here's a shot of a light I received for T&E mounted to the Glock 21SF's 1913 rail. This fits comfortably into the holster on the vest. This should give you an idea of what will work and what might not. Anything that's much larger than this might not fit.

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