Should I have stayed in the middle of the lane or moved over?

There is one section of my cycling commute with a short but steep blind hill, which you can’t see over the crest of. Obviously, it is not exactly a safe place for cars to overtake. The up hill portion really isn’t very long and I’m on an e-bike, so anyone stuck behind me has to wait literally seconds before there is clear visibility again - but that doesn’t stop people wanting to immediately go around as soon as my speed even slightly decreases.

The other day a large ute was behind me. as soon as I realised they were about to speed up to try and go past, I moved over in the lane (there is a wall directly alongside the lane so it’s hard to get all the way over). It was lucky I did that, because a car was coming over the crest from the other direction and the Ute had to swerve to avoid a head on collision. I was lucky they didn’t swerve into me.

What should I do in the future? Hold my position in the centre of the lane or move over? The road isn’t super narrow, but with the wall in the way, even if I moved over I still think a car trying to overtake would be somewhat cutting into the lane coming the other direction.