I have hearing loss also, plus constant tinnitus yeah hits me with the double whammy.
Different head phones sound different, even different models from the same manufacture, the gray ghost are great but I do not like their sound, to me they produce a tinny sound, whereas the pro golds offer a sweat mellow sound that suits my hearing loss (Different people, different hearing requirements).
My experience has been with using them on the Explorer Se and SE pro, I cannot nor will I try to say which would work best on the xterra. BUT, what I do suggest is for you to go to a good sized store specialized in detecting explain your problem and I believe and hope, they would be willing to allow you to try several different pairs of head phones out to find which set fits or suits your particular hearing problem.
It is a matter of fitting the head phone to your particular hearing, as one set from one manu would sound great to hunter A but not suit hunter B, and vice versa. Head phones are not a one size fits all type of thing, it's just like each piece of equipment you utilize in your hunting is suited to YOU.
You might also want to touch base with Ralph at sunray and/or detector pro, discuss your hearing problems with each and they might be able to come up with a solution.