Transfer WiFi to new phone?

So I have some important WiFi networks saved on my S6. I periodically use a Nexus 6 and every time I restore my Google account to the Nexus 6 it only transfers half of my saved networks. I have tried everything I can think of and I'm at a loss...

I've looked in the WiFi supplacant file, I've tried apps that are supposed to read the passwords - both of these resulted in an obvious encrypted password. I've tried deleting all my Android backups and letting a fresh backup get saved and restore that... I've tried using titanium backup to restore WiFi. Nothing has given me good results...

Any other suggestions? I'm at a loss.

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