Well, maybe this won’t help the OP, but probably everyone has a problem spot or just manages to miss a few whiskers during the shave.

I do a post shave ‘dry pass’ ATG. When I’m done with my normal 2-pass shave, one WTG and one ATG, I rinse and towel dry my face, then wash out the brush and dry the tips, clean up the bowl if used. Then I do a dry ATG pass very lightly on areas that I can feel any stubble. I will repeat, very lightly. Usually on my neck or under the jawline. If your soap is good and the razor properly honed, all is well.

That takes it all off, dolphin smooth.