Check all your solder points. It is most likely not actually reading the NAND and is just failing there. I haven't used an Infectus, but when trying something similar or Xbox 360's that's always the problem.
afaik i had 1 bad block to and i fixed my waninbrick, so if you dumped it several times still same its prob ably no problem, talked to dospierda about bad blocks (the founder of the downgrade/waninbrick fix guide) he told me he had 7 bad blocks on both flash0 and flash1, np got up and running anyway.
i would say go for it probably no problem, i wouldn't mind to much about 1 block of 1024, and the ps3 and flashing apps knows that it can't be used so it wont afaik.