Agreed that braided hoses need to be correctly "P" clipped, I got a packet of 20 P clips when I did my hoses and used most of them. As an ex-aircraft engineer I certainly know what you mean. I was surprised to find a couple of bad chaffs in the old rubber hoses down near the gearbox RH bellhousing, out of sight.......
yes, I recall finding a "dent" where one of my hoses had rubbed. When I added the under the bonnet cooler, there was the possibility of the return house rubbing where it came into the bonnet area. I just bought a larger diameter clear hose and slide the oil hose through that and the thick clear hose lays on the metal