I have a relatively new set (four months)of Helicore Orchestra strings on my bass, and I play almost exclusively with a bow. When I tune up using my chromatic tuner (at which time I am plucking the strings), I always notice that the "A" string takes much more time to settle done on pitch than any of the other strings. Sometimes I just give up. This "A" doesn't react to the bow quite like the other strings either, the "E" is in some ways easier to get a consistently pleasing tone out of. Is it possible this "A" is defective and should be replaced? Or is that very unlikely? Thanks.