quoted

    Data Offset : 272 sectors
   Super Offset : 8 sectors

The above two items are what you need for both version 1.1 and 1.2
superblocks in order to figure things out.  The data, aka the filesystem
itself, starts at the Data Offset which is 272 sectors.  The superblock
itself is 8 sectors in from the front of the disk because you have
version 1.2 superblocks.  So, 272 - 8 - size of the superblock, which is
only a sector or two, is how much internal space you have.  So, in your
case, you have about 132k of space for the bitmap.

	OK.  The 10 drive system shows:

bitmap: 0/466 pages [0KB], 1024KB chunk

	The 7 drive system shows:

bitmap: 0/350 pages [0KB], 2048KB chunk

So you think I should remove both and replace them with 

mdadm -G /dev/md0 --bitmap=internal --bitmap-chunk=65536

?

	While most of the files are large video files, there are a fair
number which are smaller data files such as those of the IMAP server and
Quicken.  I don't want performance to be too terrible for them, either.