And that is because you are using the large disc that came with the winzip kit, right?
I'm using the larger disc, but it doesn't even look like a smaller disc would even work. I am using the smallest mount now with only a little extra space added. The next size down is about 2 inches smaller. That would be a 1" difference and I'm not running 1" of washers under the brake.

I know a guy that does some CNC machining. He's managed to get a Cannondale Lefty fork working on 1 1/8" steerer tube bikes. I am probably going to have to see if he can make me one, but I'd rather buy something that was already available if possible.