What is the difference between raising the whole pickup as compared to raising the individual poles? I know you can even the string volume this way, but will the tone change as they are raised higher or lower? Yesterday I raised the poles on my GFS Nashvilles and it added more highend sparkle and mojo. Would this be the case if I just raised the whole pup? They sound so good now that I don't want to experiment anymore. I fear that I may lose the sound that I have now.