1. you don't need expertise as arms unless you are sundering for your raid (which you shouldn't be if you have a fury warrior there) so the expertise racial part is pointless. it comes down to 5% crit and 5% crit dmg vs. 15% more armor pen. you only need 90% arp (1260 raiting) on your character sheet to be arp capped for arms so mace isn't really needed since that is an easy-to-hit number in icc gear. axe spec is the superior weapon spec for arms and if you have the same ilvl weapons you should always go with the axe/polearm.
2. you are over the arp cap for arms already with the trinket proc so technically you are already wasting arp. you should regem to str and str/crit in yellow sockets for some bonuses and cut down 5-8% arp from your gear. i go with 1220 for arms and use hearty rhino food buff to hit 1260 for the hard cap. you should really start trying to get to the hard cap since with an arp trinket you are only doing the max possible dps you can do roughly 20% every fight.
3. read the arms warrior guide and the replies posted in that thread. get landsoul's spreadsheet and make sure your gear is optimized. practice practice pratice the "rotation".