I had the same issue. After installing the SSD Toolbox and during any attempt to optimize Windows would hard crash. I managed to fix the issue by updating my motherboard bios and downloading the latest RSTe drivers from Gigabytes website (I have a G1 Assassin 2 board).
The problem is the Marvell SATA controller. You were lucky to have the Toolbox work with your SSD on the Marvell controller, that does not always happen.
You could try changing the driver on the Marvell controller to the Windows 8 storahci driver, although I'm not sure if it is compatible. The Windows 7 msahci driver is compatible.
If you put your SSD on the Intel SATA II ports, the Toolbox would work fine.