Quick thought, 80 outputs is quite a lot, it might be worth looking into XQuery in TSQL for shredding the XML.

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I have done few of these huge XML imports in the passed, one of the fastest method I've used is to bulk load the entire file, line by line, into a staging table and reconstruct the XML from there using FOR XML. Sounds daunting but actually is pretty quick. If I recall correctly, 4 core server, 8 Gb ram, SQL Server 2008 R2 did average around 5-6G of XML an hour.