Specifying sql instance to use for huntgroup group lookup

I am specifying an Sql-Group required for one of my huntgroups and am finding that when looking up the group info from my database that the wrong sql instance is being used. I have an "sql_read" instance that's specified to be used in my authorize section, but when the Sql-Group is evaluated for the huntgroup my "sql_write" sql instance is used instead. Is there a way to specify which sql instance should be used in this situation? -Doug