as far as the spreadsheet, i really just use it to map out bis gear sets and to see about gem switching, so i really dont have that much knowledge about the inner workings of the spreadsheet.
about the expertise thing, i dont really know about that. for fury you cant have attacks dodged since in hinders your rage gen. having to sit there doing nothing for 3+ seconds while waiting on your next white swing to do something hurts your dps. have you checked to make sure the right food is selected since there is an option for it to use expertise food. 22 expertise + 5 expertise from the food is cap, maybe its selected instead of arp or str food.