try this method, i think it's the best out there, it only requires the first 3mb to be dumped, after that you dump/flash your nand with XeLLous:http://docs.google.com/View?id=dnfmv5h_186pp2zddm
Used this method, because for some reason I too was getting mismatching dumps (which was weird coz I never had any before (on small block and big block))
don't flash Xell without 2 identical dumps.. durr.. try extracting keyvault and config only, see if those match
btw you already have your own thread.. why not post in there..
what you could do is try and search for your answers