One of the best tips I got on the forum for EMI was too take two auto readings and then set the detector at the number right between the two. Just add the two numbers and divide by 2. Don't know why but it really helped quiet down noisy days. I also liked the "Quiet" audio type. What audio setting do you run CP?.........man I need a new PI soon.....miss the hunt and this Eureka Gold just doesn't cut it..