I read the owners manual on resetting the Pro to factory settings. When i do this the pro custom mode comes up with an iron discrimination of 35 but it also notches out several areas such as the first and the four and fifth notch. If i read the manual right it is supposed to come up The same as zero mode. Also it has gone crazy on me a few time and jumped all over the place. I go to work in the morning and will be gone for a week. The factory is closed due to weather, I live in Alaska so I don't quite get that by the way.