If you use multiple owfs nodes you shouldn't need to delay them, I advise against using the checkbox method in the node., it is safer to explicitly set the topic. Using the checkboxes a problem can arise if you open the node when one of the sensors is not available, it will be removed from the list of sensors to be fetched and will not automatically be re-included when the sensor recovers, unless you open the node again. I do it like this
In addition it is worth looking at aliasing in owserver. It is very easy to do that and then you can use addresses like /bedroom_temp/temperaturerather than 26.E1CD92010000/temperature.
