Hi,
In the description you wrote that it is possible to set spike rejection and watchdog threshold in range from 0 to 7. From the graphs in the documentation I think that it is possible to set spike rejection in 0-11 range and watchdog threshold in 0-10 range. Can you confirm that?
Did you test different spike rejection and watchdog threshold settings? I am thinking about setting them both to 0 to make the sensor the most sensitive. Wouldn't it make any other problems?