Windows 10 1803 Hyper-V IPXE initialising devices

[NiKiZe]

If this is the same issue, then post in that existing thread.
You have one quite major difference and that is that you are using ipxe.iso while in http://forum.ipxe.org/showthread.php?tid=10998 undionly.kpxe is mainly used (it is loaded by chainloading over original PXE stack)

You might want to test with both clean 1709 installation of windows and clean 1803 - without any additional updates and see if that gives any difference in behavior.
Wouldn't surprise me if this was fixed in 1803 but some later update then caused issues again.