One lesson learned. I took my e-trac and used min discrimination. I set the FE01 01-37 discrim on and FE01 49-50 discr on. This keeps the iron from wrapping. Also, put a little discrimination at the bottom. Wow, I was using my 8x6 SEF coil and it hit a Merc and it was screaming. I had been over this area over 6 times with all kinds of coils. The difference was the setting on the discrimination. U do not need a lot of discrimination. The detector was very stable and quiet. Was running mult tone and conductive. I have been using the e-trac for over a year and this was a ah ha moment. Give it a try and you will be amazed.