I just put a new set of Thomastik-Infeld Power Bass strings on my Roscoe Beck 5. Now I have some set-up problems. First, the nut slot for the D string seems to be a little tite. The string is 0.068" and the nut is probably cut for 0.065". Should I reslot the nut? If so, where can I get a file with that guage? Second, the B-string barely intonates correctly. I had to move the saddle all the way back. It was close but not exact. I had to lower the string more than I wanted to reduce the break angle. Is this because of the smaller diameter, (0.119")?