2010 Kestrel RT 800 SL with internal cable routing. Just put on a whole Ultegra 6800 group set. When I installed the new brake cables into my frame I hear a scratching/rubbing noise in my top tube. And the lever action is not as smooth as the front brake. I took everything apart and made sure the ends of my brake housings are clean and smooth. I used the same silver ferrules that were on the bike before. when I removed the old cable there was nothing in the frame that broke, fell off, or is rattling around inside. I don't understand what could be different from before.

Help? Please.......