You have to set Force after each BIOS update to update the included Marvell firmware from within each BIOS, you'll see it updating on the top of the screen on the next reboot after you set that to Force. Then next time you are in the BIOS it will be back to onchip or auto automatically.
Please also be sure you are using the latest motherboard BIOS, use Qflash or DOS to update.
Those ports are not suggested for OS SSD's, you will only get faster sequential read speeds, that is it. The intel ports are far better, higher 4K speed which are what matters, and way more stable for your OS drive.