There's gota be a better clamp.
Yes there is: Rifle billet fork clamps

A while back, I had used Memphis Shade hardware to mount a batwing fairing on my Tourer.
Later on, I have swapped batwing faring models, and have also ordered a set of Rifle billet fork clamps.
These are very solid nd have not let me down ... since 2003.

Note: The set contained 4 clamps ... but I have only used 2 .... and have the other 2 on a shelf in my garage.

Check this PDF for more info.
http://www.jpcycles.com/instructions/pdf/750-592.pdf