Hey Stuart! Yeah I've abandoned it on FF completely for bows over 130lb as they're I just impossible to unbrace.
Interestingly at a Warbow Wales shoot recently I had a linen string snap at the running loop as well, on just a 110lb bow. I don't serve mine as I think it makes the strings too heavy, so I am starting to wonder whether it's a historical method or not. Hemp would break even quicker as it apparently can't handle tight bends at all well.