You're plenty tanky enough-- so yeah you could handle losing some defensive stats in order to kill things faster.
You'll die less to trash-- you won't be able to kill elite packs with your dps within your serenity duration, but you can do some damage and get out of the really scary ones while you wait for cooldowns and kite with deadly reach.
Also, your ring has a socket without a gem in it. You've probably fixed that, but that's what your profile is showing right now.
Your gloves would be a cheap upgrade. Get something with some crit chance in addition to attack speed. I wouldn't worry about crit damage until you have over 20% or so. You could get an amulet upgrade with attack speed and crit for less than a million. Or crit/crit if you're not set on attack speed(I like it as a stat and have it on a lot of slots).