Regarding light transmission from the headlights, through the shield, yes I have had shields do that at night- a very noticeable and distracting line of light all along the top edge. I have tried black paint along the bottom edge, but couldn't make it cover well enough- maybe wrong kind of paint? But for what it's worth, several years ago I talked on the phone to a rep from Cal-Sci, and he recommended simply hitting the bottom edge of the shield with some fine grit (~200 ?) sandpaper. I followed his advice and it worked like a charm. (I did not actually buy a Cal-Sci shield at that time!)
Now, last Fall, I was about to buy one of RealShelby's shields, but I snoozed on it and missed out. So I thought to try a Cal-Sci, and bought one to fit 2012-2016
model years (my bike is a 2012), unlike how Madstad brackets are made to accomodate Gen-1 shields. Cal-Sci supplies their own proprietary brackets, and I found out that, using their hardware, the Barkbusters could not go full lock without hitting. I did give it a short run anyway, but didn't think it worked any better than the Madstad bracket with Adventure shield that I've been using for the last several years. Also, the shield that I got from Cal-Sci did not have the venturi cut-out (or whatever they call it, I forget).
Your use of the Cal-Sci shield, PLUS a Madstad bracket, is something I have not tried. I considered it briefly, but wasn't about to drill extra holes in the thing and make it non-returnable. And it's one of those things now where, the more money gets spent looking for "perfection", the more diminishing the returns! Looks like a good set-up though, enjoy!