Tankwell, I'm not calling you a liar, but I find it hard to believe that you need any advice. You've got very solid gear/stats, it looks like you've got things figured out pretty well.
As far as itemization budgeting goes, you'd be better off with +def on your chest and shield rather than the +stam/hp -- but you're already crit-immune, and re-gemming your gear would only result in a difference of about 20 stam.
You could stack defense beyond the crit threshold. With your gear you could probably get to around 570 skill defense and still boast over 30k hp. Stacking +def is attractive because it doesn't suffer from diminished returns like stacking parry/dodge. I've never seen anyone do it with noteworthy success though, so you'd probably just look like an idiot.
All-in-all, I'd say you're perfect. The only thing I'd change is dropping your shield enchant for Titanium Plating -- you clearly don't need the 18 stam, and 40 BV is nothing to shake a stick at.
>>>Hallelujah<<< Lightning's Blade Maintankadin
Unbuffed: 30934 HP, 105.66 Avoidance, Crit-immune