The space changing to %20 was never the problem... browsers automatically display spaces in web addresses as %20. Putting in the URL in the file as "You Bastard!_files" is the exact same as You%20Bastard!_files". No need to put the %20 in the HTML, because the user's browser will do that itself.
Now then, I'm unclear if a problem remains. To me, the YB page looks fine. Is there anything that still needs to be done or fixed? If there is, I can try to help, but I won't be fully available until later today, though I can try to offer some quick help in the next hour or so.