Issues getting my new cloned NVME to boot on x370

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   I have a Samsung SSD, boot type MBR/Legacy (Windows 10) on an x370 Taichi.

I purchased a new NVME drive, installed it, and used software to clone (tried both Macrium Reflect and Mini Partition Tool) the SSD to the new NVME drive. Since NVME boots UEFI, both softwares allowed me to convert the drive type to GPT while cloning.

Each clone was successful, so I would then turn off the PC, disconnect the original source SSD drive, and try to boot Windows from the NVME. No matter what I do, I get a blue screen error that says "winload.exe" cannot be found.

I have tried changing a few things in BIOS, but nothing seems to help. 

If CSM mode is enabled, it will show me the PCIE SSD as a boot option, but won't boot from it and will give same error. The only other option in the boot drop down is UEFI EFI shell, which of course just repeatedly cycles me into settings.

If CSM mode is disabled, it will not show any PCIE SSD from Bios, and only show UEFI EFI shell as the boot option. I can use F11 on reboot to get it to show the PCIE SSD again as a boot option, but still the same blue screen again.

Any ideas here as to what the issue is? I have run chkdsk on the source with no issues as well.

Any advice would be great. I didn't see a clear enable/disable or "switch" for Legacy/UEFI in the Taichi bios, but my understanding from reading around is that it will automatically detect the correct boot for the drive regardless of if CSM is enabled or disabled, so I'm not sure what this error keeps coming up for.

(I'm aware that a clean re-install would be ideal, I am just hesitant due to the amount of programs/plug-ins that I don't want to re-install and have read several success stories about cloning SSD to NVME, but ultimately may go that route with no solution).

Thanks!