Determining source of failure for soapUI Runner

I have a simple LoadUI TestCase (Virtual Users -> soapUI Runner -> Statistics) for load testing a complex soapUI TestCase. The soapUI case is designed to load usernames from a DataSource (.xls), login to the web service, and hit a number of endpoints. When I select Run Once, the test always completes without failure. When I try to simulate load, even a small load, up to half of the runs fail. Is there any way to get some debugging information about the source of the failures?

The load is being distributed to a loadUI agent installed on another server, and I can see some DEBUG information printed to that log as the tests are run. Is there flag or something to make that output more verbose or to perhaps add some groovy scripting in my soapUI TestCase to print to that log?



Edit: And of course I meant to put this in the Community Board and not the Feature Request page >.<