PITA to bleed, set up and use!
????? Avid Elixirs are by far the easiest brakes to set up and bleed that I have ever had. What is so difficult about them?
OP, check the allignment of your callipers first and foremost, the cup and cone spacers you get with Avids can mean that the calliper might not be on 100% straight but the bonus of these is you can change the allignment by fractions of a degree just by untightening your bolts adjustign and retigtening. Also as has been mentioned try a bleed and fully push back your pistons mid bleed as you may have too much fluid in the brakes.