"Reboot and Select proper Boot device..."
Raid is a different storage structure than what your original drive was using, ACHI, most likely.
Because it is a different storage structure, windows is unable to find the boot drive because it does not have the raid drivers.
When you change to Raid, you will need to reinstall windows and install the raid drivers during the install to be able to boot into windows.
if you switch back to achi, you should be able to boot into windows.
I never change from AHCI to Raid. I planned to, but didn't ever get that far lol.
But, I did figure it out. It was a 1TB internal hard drive I was going to be replacing with the SSD's. I had never plugged it in, and Windows must have needed that drive as well in order to boot.
For reference: Original setup was a 128gb SSD as my boot drive, 1TB internal as data. New setup was 128gb SSD as boot, 2x256GB SSD's (to be used as data). Plugging in the original 1TB internal allowed me to boot. Thanks all.

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