Blue Max or Bullseye?

You didn't mention the coil size. If you're referring to the Bullseye 5.3 versus the Blue Max 600, they are virtually the same coil. Either one will work fine on the XLT.
 
I haven't used the DD coil, so I can't provide you with a comparison. What I can tell you that the 5.3 is a great coil. I use it way more than the stock coil.
 
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