Can it sound like it affects your intonation? On my Tacoma acoustic CB10 I still have the original phosphor-bronze strings it came with. The bridge is not adjustable. My open notes will be in tune, yet when I go to the octave at the 12th fret, it sounds slightly flat. I know that I am pushing straight down and not bending the string as I apply it. Has anything like this happenned to anyone? Thanks.