Time to pushing it as DNS for router !
On a new Raspbian image, I would expect the head file to contain the first two lines - just comments without any functional effect, so an empty file should result in the same behaviour.
My addition was the nameserver line.
And now that Pi-hole is running, make sure ýou remove that line and restart:
If you leave that line in, a good share of your DNS queries might use that nameserver instead of Pi-hole.
Grrreat it's working for you 
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