1. Upgrade to the latest firmware version first.
2. You have to set DualHead to Yes.
3. You have to set HighLevel correctly on both the head and the rim provided they both are not too "hot". "Cool" them first if they're too "hot".
4. Once the above is done you have to adjust DualMidPoint to get correct separation between the head and the rim.
If you don't want to deal with two zones now and want to get good triggering on the head first, disable the rim by setting the Note to 0.