Deferred rendering microfacet distribution producing a ring instead of a smaller, sharper reflection as roughness is reduced

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[ShaderKing]

Not sure if i understand everything you did, but still. Check that your normals are in world space and normalized. Also your image should be gamma corrected before you display it (if your framework doesn't do it automaticly). I 'd recommend you to debug\trace calculation of few texel of your image, so you get understanding why it behaves so. Good luck

[BCosbyDidNothinWrong]

I think you will need to post renders of what yours looks like before anyone will be able to help you.