Greetings, I have a j-40mc Jumbo Martin with an interior pickup. My problem is the low e strings sustains to much causing what is close to feed back. I tried eq-ing it out but lose the sound. I'm new to NC, relocated from Laguna Beach, CA, and don't have access to a guitar shop as of yet. Is there some thing I can do to make this tolerable until I can get it professionally fixed. Thank you for your input.