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As for exposing the tank underside, even with big spacers like Chewy's I don't think it'll make any real difference...
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Northy, with correctly set-up jets the difference is massive, like I said I've lost 40mph! This is with a BMC Race RS. K&N users won't see much difference because as people generally know the filters are more restrictive at top end. I've been improvising with some longer bolts and form to see what difference it makes.
I need to explain my idea better. This will be one or two tubes leading from the top of the airbox next to the filter top to the bottom of the airbox.
Currently the tank blocks air-flow to the filter top as Northy says. I shall be funnelling an extra supply of air to the filter head from the bottom/left-right of the airbox. When the filter can't get enough air from under the tank it'll feed from the extra funnels whatever 'top-up' air it needs.
Making the airbox have a different height is also an option, possibly by heating up the top and squashing it down a bit.