I have the same set-up, but I believe the spoiler is there primarily to eliminate annoying/blinding headlight refraction on the windscreen (of any size)…it doesn’t have much to do with wind protection, though I suppose there could be some residual impact. That’s why you won’t see the spoiler on there by itself, it’s only present in combination with a windscreen.
Yeah, as soon as I posted above, I thought, Wait a minute, the spoiler does have those deep grooves which presumably lead to alleviation of back pressure and subsequent turbulence, so, yeah, i stand corrected…it does seem to be doing double-duty with both glare and turbulence.The under screen spoiler directs air up and underneath the screen, to reduce the air pressure lift and natural turbulence on the trailing edge of the screen. By reducing the trailing turbulence between the upper and lower surface of the windscreen (like on an airplane when it raises the flaps after takeoff), the rider experiences less buffeting and smoother windflow.
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The Wunderlich fairing you have is a more significant redesign, and is not available for the 1250. It looks good (imho), but I still prefer a more naked design. What is your height?