Server driven PST migration Locator Task setting

Everytime we run the Locator Task, it spends three hours searching the domain for new computers before it starts searching for PST.  From the report, it shows: "Search for new computers at start of new search cycle: True".  Is there any way to set it to false?  I don't see any setting for that in the task.  We want to search for PST right away.

Thanks.