Upload (lift) from the tail?
I don't think so.
Also, my mate (a test pilot on Eurofighter/Typhoon) told me that his aircraft was the only one he knew that did have upload from the back end.
Remember:
aft CG = less stable in flite therefore more difficult to fly manually BUT better fuel consumption because the tail is producing less downforce = reduces apparent all-up-weight;
fwd CG = more stability (think a dart at the pub) therefore easier to fly manually BUT worse fuel consumption because tail is producing more downforce to balance therefore increase in apparent all-up-weight.
f