I've ordered some tape and in the meantime have masking taped a thin sponge to the bit on the rack that is doing the damage...its basically a corner of metal that has already trashed the paint off one side of the brake...I leave it every night in a position where no paint is touching the rack but when I went out today it had more new scratches on the fork from rubbing against the rack when neighbours knocked my bike getting theirs out
These racks are designed to put the bike up on a slope but my frame is so light that the pannier rack causes it to rear back off so it's difficult/dangerous/impossible to put it up like that so I lock my bike to the side of the rack, like most others in the shed.
I just wished i'd identified the scratching bit sooner.
Having said that, I took it out for a ride today and was slightly less worried about it getting stolen when I parked it up.