Restore Recovery HD partition from Yosemite downgrade

I recently got back to Mavericks from Yosemite, everything went fine. As I normally do, I checked my HDD with the Disk Utility and found some trouble, then I boot on recovery mode to fix my HDD. I realize that the recovery partition was the Yosemite one (It's easy to see since the UI is different)

I want to get back my Mavericks recovery partition, so I followed along this instructions.

But my diskutil list output is a little different:

/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.1 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage                         499.2 GB   disk0s2
   3:                  Apple_HFS EraseRecoveryHD         650.0 MB   disk0s3
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           *496.1 GB   disk1

I deleted my recovery partition successfully with the command:

diskutil eraseVolume HFS+ EraseRecoveryHD disk0s3

But when trying to merge using this command:

diskutil mergePartitions HFS+ "Untitled 1" disk0s2 disk0s3

I get the following:

The chosen disk does not support resizing.

I don't know why my disk0s2 does not have a name and why do I have a disk1

BTW, I tried to avoid this trouble just by using the recovery partition I have (from Yosemite), I ran the repair disk option on recovery mode, then I booted on Mavericks and the disk utility says my HDD has the same problem as when I first checked.