Looks good. I believe that Vf goes up some when xml2 emitters are put on copper. I think Match's testing indicated that, but I think he had some reservations about his Vf measurements. I'm too lazy to look up Djoss's testing results right now. A higher Vf will reduce current because the cell has less juice to deliver at the higher voltage.
EDIT: Here is a link or Post 51 from Djozz's xml2 on copper crash testing. I don't know how the Vf compares to aluminum though.