On the DFX, their Is a relationship between the pre amp gain and the AC sensitivity. Same deal on the F-75. Now that ML has seen fit to give us the suggested sensitivity level on the ETrac it should be possible to go to a site, lower ones gain and see if that gives you the ability to turn up the sensitivity while still maintaining stability and decreasing falses. I know on my SE there is definitely a gain/ sensitivity relationship where many times if it runs sloppy, I can turn down my gain and bump up my sensitivity giving me more depth and better ID accuracy with less falsing.