Is it acceptable to cycle towards the centre of the lane on blind corners?
Yes, you should absolutely be taking the lane, provided the car behind you will have time to slow down when you move to take the lane.

Passing too close, passing on a blind corner, passing that endangers others and yourself, these are all equally dangerous. This sounds like a dangerous situation all around, I highly recommend you record your ride so if someone does hit you, you can make quick work of the insurance claim.