If you haven't already tried them, take a look at the Altras. I've found that the Lone Peak (versions 3.5 and 5) are the most comfortable shoes I've ever owned. It took me a while to get used to the zero drop, but it sounds like you would have less trouble, since you're used to the Xero shoes and going barefoot.

I see Xero shoes also have trail runners.
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Always remember that you are absolutely unique, just like everybody else. -Margaret Mead