An 808 front/404 rear should outperform a 404/404 or even a 404/808 combo. Unless there are strong crosswinds -- those produce the legendary "lift" on an 808 rear, but are likely to make an 808 front twitch more.
In any case, 808/404 is just wrong for aesthetic reasons. It may be more efficient. But it's wrong. Just like running around with your zipper unzipped is wrong -- even though it's more efficient.
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