So how was the disc brake tab set up? Do you need to place the wheel in the rear-most part of the drop outs to keep the disc brake aligned? I have a disc brake cross bike that is fairly similar to yours now, but I have a standard vertical drop out. I'm curious as if I did what you had done, I'd probably just set it up to have the wheel all the way in the drop outs for ease of installation and lengthen the wheelbase.