there are a few things you can change:
change your str/haste gems to str/crit
drop your expertise/hit gem, you are well over the hit cap and even if you went down to 25 expertise that is ok because the cap is like halfway in between 25 and 26.
change your meta to a 21agi 3% crit damage one and then drop the purple gem in your ring for an arp one so you are closer to the soft cap
for your spec drop two talents somewhere and max our intensify rage (I would suggest the 2 in imp berserker rage but that's just me)
Do you have any parses we could look at? they would be a big help in determining any further issues.