Hmm might be more preferable disk layout, but what do you think of:
# 0: 1000 TB Disk
# 1: 100 mb ESP
# 2: 512 mb /boot [vfat,ntfs,ext2,3,4]
# 3: 730 gb C: NTFS
# 4: 128 mb MFS [vfat,ntfs]
# 5: 8 gb SWAP
# 6: 20 gb / BTRFS
# 7: 170 gb /home (encrypted btrfs)
I have no experience with UEFI, is it required to copy content among OS' ?
But IF, i'd say yes, in that order.
Is there a reason you increase the size of ESP? Is all that space used?
100 mb for /boot might be a little short, even for one OS.
Just in case you play around with diffrent distros, you might need a bit more. 512 should suffice for up to 3 diffrent linux.
Differing /home with your sensible data from the root might increase system stability, while keeping it savety where its needed.