dont gem for crit. switch your meta to the relentless earthsiege (21 agi/3% crit dmg) and use a nightmare tear in a blue socket that will give you a str bonus. you should re-gem for arp until you get to 52% so you can be soft capped with your trinket proc. dont gem for expertise, its not that important to cap it as arms. move overpower to the top of the priority list if you are below expertise cap, you dont want a tfb proc to overwrite a dodge procced overpower. everytime you have an empty gcd (rend on target, ms on cd, no sd or tfb procs) you should slam. arms is all about using every gcd, and if you have holes your dps wont be the best you can get out of you gear. get the agi cloak and not the str one for frost badges and pick up the t9 chest with triumphs imo.