I still think there is only 1 actual bad block at 0x1B8.
What I'd be trying is this... On the original NAND, repair the SPARE on the first 0x2A blocks I mentioned. Those blocks have small block SPARE format and I think that's why nandpro gives error 240. However, assuming the data part is fine then you should be able to repair the SPARE using nandpro +w somehow. I'm not at home so I can't give the exact commands right now.
If that can be repaired to the point there are no ecc errors and only the one bad block, then build the image with Xnandhealer or Multibuilder and give it a try.
Martin, are you able to advise how to rebuild the SPARE?
And nymphetaminer, what is the history of this console? Someone has messed with the NAND judging from your upload.