You can forget the second parameter "StartOverride".
I recommend to change the connectotion for the SSD or HDD, because the SSD will work better under the intel SATA poets, the MB has 2X SATAIII + 4X SATAII.
1) put the 2 SSDs into the SATAIII, the HDD into the SATAII, make sure you boot from the HDD with win8.1 ( change the boot oder in the BIOS) . You need install the intel RST driver ( iata_enu.exe) from intel site.
https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=22194
2) After install that driver, boot the PC ( still under the HDD) go into the BIOS to set the storage mode to raid, reboot the PC, and press "Ctrl" + "I" to set the raid1 for SSD.
3) Reboot the PC into the safe mode by press "F8". In the registry HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\iaStorv or iaStorV, make sure the value is "0". If you use the intel sata port, if you use the marvell, check the name like mvs92xx something like that, but you have to install the marvell sata driver.
4) Reboot the PC, make the cloning.
5) After cloning, go into the BIOS, change the boot order to the raid, reboot, and you should be able to use the raid.
Or you can even use the raid like in the link too. ( win8.1 is same the win7)
https://www.youtube.com/watch?v=cKDCmOBqNBY then make the cloning.
Or even you do not need any cloning because the win8.1 is in the SSD, you just install the intel RST, and change to raid mode in the BIOS open the intel RST, change the registry, then make the raid , you need make sure to check the "keep the data" when you set the raid, here is one of video
https://www.youtube.com/watch?v=rmLt4W-F3Ww