Yup - the hunch factor isn't a "bug"; it's absolutely intrinsic to the process. Not only is fundamentally irreducible - you wouldn't want to completely remove it from the process, even if you could.

So I guess the problem with objective-seeming (and often just simply gratuitously hard) "filter" questions like those suggested here is that their real purpose seems to be give the process an appearance of objectivity - "We had a guy in here, his code samples looked great, and he talked a great game and all -- but would ya believe, he totally froze on that Lego robot puzzle question! What a poser!" -- when of course it's never going to be anything of the sort.