You would want to add values to your boundry normal and makeup tables, which delays the injector pulse, in an attempt to prevent introducing fuel during overlap until things improve. Generally 1 -2 increase is enough. You should also see your idle fuel trims richen slightly when you do this.
If the "smell" at idle is burning to the eyes, it is due to high NOX levels from a lean mixture or too much idle timing, or both. If it is smelly, but not irritating to the eyes, then it is simply rich.
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Jaime
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