Have been out 4 times with my new etrac this spring. Been running in ttf with goes4ever settings with sensitivity at auto +3. Have noticed my sensitity is always at 26 and have never seen it change. Have hunted in 4 different locations all loaded with iron(old farmsteads). Is this normal? These places are farmfields in north dakota, fine sandy to sandy clay loam soil types. Alot of these farmsteads had barns with feedlots so soil acidity can vary greatly. This is backed up by sometimes finding wheats that are corroded in these areas. Just seems there should be some variability to the sensitivity.