I've been having an issue with this pickup for quite a while. Only on open D, and D on the A string, I'm getting a huge amount of, I guess you can call, feedback. I dont know if the D string is know for sympathetic vibrations or what, but its gotten to the point that I have to put the upright down and play electric. On swinging charts that the changes move around, its not a big issue. But on ballads, or songs like Impressions with the Dm, it just unbearable. What is causing this and how can it be fixed?? I'm using an Aguilar 1x12 and a GK 700 RB. I would say its my position, where I'm playing relative to the amp, but it does it in just about any location I play..