I tried an nDepth search in my lab, and it worked for me. I honestly don't like the "RefineFields" options since they're sort of a blunt instrument. They work, but there's a better way!
If you use, for example, "UserLogon.DestinationAccount=*USERNAME*" I think the results are better/more consistent.
I'd include screenshots, but THWACK is being silly for some reason.