Hi,
I ended up going through all my static mesh LoDs and halving every value, that seemed to make it about the same as it looked in the Editor.
I still had issues with skeletal mesh LoDs but realised that was because I had been messing around with the scalability settings so much that they were lodding early.
It seems much better now although it could be a bug in the VR screensize calculation but I would find that surprising (I’m using UE4.24.2).