I've done 1 re-x already & it turned out much whiter than I started, but there is a slight hint of yellow still.

I was interested in possibly doing another re-x, but worried I would lose some DMT yield in the process?

I realize I'll lose some weight yield if the yellow gunk is left behind, which I want, but I'm worried about losing the "Good" white/clear spice in the process, is this the case?

Well, By definition purifying involves taking something out. So your yield HAS to be less. But if you mean, "will the naptha pick up some spice and not give it back?" if the naptha is evaporated it has to give it up... so you shouldn't loose it.

Ahh yes thats what I meant. I realize that it will leave behind yellow gunk, but I was just concerned with the naptha picking up spice & not giving it back.

I plan to freeze precip after I re-x to get all the spice back, hopefully even cleaner & as pure as possible.

can you crudely manually separate the white crystals from the yellow stuff? then you just recrystalize the yellow stuff with a bit of the white, and you dont need to risk losing much of the white...