Err, sorry if I did not make myself clear. Perhaps some mutual misunderstanding.
This is what I thought you had:

This is what I wanted you to do:

First, delete your new partition:
Next, move Optfs down:
And lastly, create a new partition in the vacated space:
Note: It does not matter if your swap and new partition have swapped places.

Edit: If your setup looks like the above and Maemo does not see the new partition, then perhaps you've forgotten to format it? Try formatting it as ext3, followed by a reboot.

Edit 2: You can now copy your ED content to the new partition. It will be /dev/mmcblk0p3 or /dev/mmcblk0p4, depending on your specific arrangement. You can use dd as in the post you've linked but that will only work if the new partition size exactly matches the size of the image. A better approach is to use cp -a like here, adjusting for source and destination (/dev/mmcblk1p1 and /dev/mmcblk0p3 or 4, respectively). Finally, edit your .chroot accordingly and you are set.