Hello LRC1962,
you have more than one alternative superblock, I think.
How did you choose yours?
man e2fsck:
-b superblock
Instead of using the normal superblock, use an alternative
superblock specified by superblock. This option is normally
used when the primary superblock has been corrupted.
man mke2fs:
-n Causes mke2fs to not actually create a filesystem,
but display what it would do if it were to create a filesystem.
This can be used to determine the location of the backup
superblocks for a particular filesystem, so long as the mke2fs
parameters that were passed when the filesystem was originally
created are used again. (With the -n option added, of course!)
greeetings
musca