FileVault + SSD + OverProvisioning

[KariNeko]

Hi,
As the title says, could someone accomplish this?

I couldn't.
FileVault 2 wizard tells me that the it isn't compatible with the disk.

I have only 3 partitions on main disk, and Recovery HD was cloned from original Macbook HD.

macbook-pro:~ $ diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *256.1 GB   disk0
   1:                        EFI                         209.7 MB   disk0s1
   2:                  Apple_HFS MacOS                   200.0 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

macbook-pro:~$ sudo gpt -r show -l disk0
      start       size  index  contents
          0          1         PMBR
          1          1         Pri GPT header
          2         32         Pri GPT table
         34          6         
         40     409600      1  GPT part - "EFI System Partition"
     409640  390625000      2  GPT part - "Customer"
  391034640  107536528         
  498571168    1269528      3  GPT part - "Recovery HD"
  499840696     277463         
  500118159         32         Sec GPT table
  500118191          1         Sec GPT header

There are 2 places with unpartitionated space. One after my Macintosh "HD" and one that resulted from resizing a 700MB partition to on 650MB for the Recovery partition.