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I just finished my first flamenco (still in the white) and I've run into a problem.
Open high E sustains like crazy, same at the 12th fret. Even when I pluck the string and then mute it completely, the guitar keeps resonating at that note.
It is also doing the same thing on the B string but to a slightly lesser extent.

Interestingly enough, when I remove the other strings, leaving just the top 2 - they act completely normal. No wolfing.

Anyone experienced something like this?
What are my options for fixing it?
Can I hope that with some french polish and a different set of strings the problem goes away?

When you say the problem goes away when you remove the other strings, it makes me think that you're not hearing a wolf note but rather sympathetic vibrations in the strings. Put tape on the inside four strings to mute them and see what happens...

I think you've got it! I just never had this effect so strong on my previous builds, maybe the light flamenco construction makes it so much more pronounced?

I also think you are experiencing the difference between a responsive guitar and an average guitar. You are getting overtones you may not be used to, and there is lots of sympathetic string vibration in a highly responsive instrument. It's the reason good players are adept at muting strings not in use when they want cleaner voice separation. I also agree with Todd. Put a finish on it and see how much it changes, as it will definitely change.

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Waddy

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I never bothered to string a guitar up in the white, it's gonna change a lot once you finish it. I always like when my classical guitars body resonate at around B flat.. A Flamenco that resonates on A is kind of nice though. I've never done this but I have heard of a technique where you can play the guitars resonance frequency and feel along the sound board for where it's vibrating most and stick a piece of gummy substance there to dampen the resonance.

If the high string sounds like Howling Wolf does the low one sound like 'Muddy'?

Sorry.

Congratulations; you just built a responsive guitar. It will be less responsive with some finish on it: added mass and damping will see to that. If you need some more control a heavier bridge, or added mass inside, might just do it. OTOH, the player may love it just as it is, so check with them first.