Your spreadsheet is pretty generalised. There is nothing about cool down usage or ideal ways to handle specific spawns or mechanics to optimise dps. It's just a list of what spec to play on which fight with pretty standard talents and glyphs. Also unless you're in a guild that has cleared at least 13/13H at this point, by the time you end up having to do serious progression on single target Fury will be the stronger choice. Arms is only looking good right now on single target because of the massive boost you get just by equipping the 4pc that is propping it up.