Hi Hilary,
I haved to apply your step with my work in InfoPath 2010, but it differs from you when I set up tns:listName and tns:updates. I get /myFields/ListCollection, while you get /ns1:myFields/ns1:ListCollection. Moreover, I get /myFields/Batch, while you get /ns1:myFields/Batch.
I'm not sure that is a problems that makes my submitting ...