I'm not finding any discussion anywhere on the subject, but am wondering if the fact that this search table's "Update Index in Background" is enabled, is overriding the sp_fulltext_service('resourceusage') setting. That setting was 4 and I bumped it up to 5 (highest level) but noticed MSDN lists a setting of "1" as being "Background".
The database server has enough horsepower that it should be able to make MSSearch its highest priority and still have more than enough resources left to do all the SQL stuff it has to do.
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