Fusion drive DIY not using SSD

Hello community,
Recently I have bought a SSD drive for my Mac Mini 2012, in order to make a dual hard drive installation ready to build a DIY Fusion Drive with Disk Utility. Apparently it works well, I have installed Yosemite without any problems and been using the Mac Mini normally. The problem is that it's very slow performance when it needs to read/write from disk, I've got around 40mb/s read and 35mb/s write speeds on BlackMagic disk speed tests.
In addition, checking the installation of the drives running "diskutil list" from command line (which tells me that disk0 is the SSD and disk1 is the HDD), and the disk usage with "iostat disk0 disk1 1" I can see that the OS is not really using disk0 but disk1 for all disk operations.
I noticed that eventually disk0 has movement but 99% activity is in disk1 (HDD). I believe that the normal behavior of a Fusion Drive is using SSD mainly and HDD in second instance for "not-cached" or less used files, but I am experiencing the opposite behavior.
The model of the SSD is Kingston HyperX 3K 240GB.
Please give me any advice about this issue.
Thanks for your help.
Best regards.

Thanks for your replies.
Actually the SSD it's installed in the upper bay, because I've tried to install it at the bottom but Fusion Drive seems not to work, failing disk verification and prompting me to repair disk. In the upper bay seems to work fine, but I've this this issue.
This is my "diskutil cs list" output:
Mac-mini-de-Arturo:~ Bayo$ diskutil cs list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group FB3EEBCC-EBDA-4F7A-9256-0AE4A854C512
    =========================================================
    Name:         Internal Drive
    Status:       Online
    Size:         1239058448384 B (1.2 TB)
    Free Space:   0 B (0 B)
    |
    +-< Physical Volume 3D0A6EE0-51FE-425C-B716-89215472D2D9
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk1s2
    |   Status:   Online
    |   Size:     239713435648 B (239.7 GB)
    |
    +-< Physical Volume 397E16F1-877B-412B-8D7D-59A5BD47661A
    |   ----------------------------------------------------
    |   Index:    1
    |   Disk:     disk0s2
    |   Status:   Online
    |   Size:     999345012736 B (999.3 GB)
    |
    +-> Logical Volume Family 8FEAC5E2-11F2-4FE7-B980-945A0B81463C
        Encryption Status:       Unlocked
        Encryption Type:         None
        Conversion Status:       NoConversion
        Conversion Direction:    -none-
        Has Encrypted Extents:   No
        Fully Secure:            No
        Passphrase Required:     No
        |
        +-> Logical Volume 1621B9C3-17F9-4ABC-B8FF-767FEF074A94
            Disk:                  disk2
            Status:                Online
            Size (Total):          1230265384960 B (1.2 TB)
            Conversion Progress:   -none-
            Revertible:            No
            LV Name:               Macintosh HD
            Volume Name:           Macintosh HD
            Content Hint:          Apple_HFS
and, for more info, a screenshot of my current speed test with BlackMagic:
Many thanks!

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