@dudenamedben What hardware are you booting on?
For your INFO
snponly.efi is to undionly.kpxe
as
ipxe.efi is to ipxe.kpxe
In the only boot loaders, snp and undi use the built in nic firmware drivers to talk to the nic card. Where ipxe. has all of the network card drivers built into the ipxe boot loader. In the early days of uefi the snp drivers were terrible, that is where the FOG developers recommend to use ipxe.efi. The problem is with very new hardware, the iPXE developers might not have included the drivers in the ipxe build just yet, where the snp nic driver will work.