I know your many disk setup and i would try to simplify things.
you dont need to format and partition before you install. actually it is best not to as it can all be done from the installer.
the better way to do it is instead of creating partitions for /, /home and swap before the install is to create free space on the disk where the partition were going to be.
ie delete the partitions and leave it free (no partitions).
now when you install, at the partitioning part you could choose "use available free space" but this will only create a swap and / partition in the free space you left.
but you want a /home partition so you choose manual partition. then using the free space you create your /, /home and swap partitions.
this way you will know where they are and what they are called. also /home will get mounted correctly.