Have you tried deploying OVF directly through ESXi, not through vCenter ?
Sometimes, it works so would recommend if not already tried.
What is your VMs guest OS version?
Why you don't try a VM backup solution for your purpose? (or even replication if it's possible in your environment)?Please mark my comment as the Correct Answer if this solution resolved your problem
Hello, I have tried deploying directly through ESXi. I was successful with 4 of the systems...but not the remaining ones.