[Triumph]

Well from what I hear it goes sometihng like this (for all three):
normal elrues give you no higher chance of achieving a +
blessed elrues give you +1 higher chance of achieving a +
lucky elrues give you +2 higher chance of achieving a +

Only because a lucky elrue gives you a higher chance doesn't mean it'll work all the time. In fact you might have an unlucky day where they fail. But maybe you'll have a lucky day and your elrues will work. I had my lucky xir not work (didn't break) and I used my blessed xir and I got it to +.

Also, the enchantments look different when you use Blessed/Lucky, I think.