Hi GLW,
I've camped at Port nam Murrach many times - but gave up using the place several years ago except in winter as it gets too busy. There will be plenty others there, and numerous kayak companies use it for camping. The landowner put cattle on it a couple of years ago to deter some of the numbers camping, but it didn't do much to reduce the use.
This might help....
http://mountainandseascotland.blogspot.com/2019/07/home-run.html. If you want a couple of recommendations for quieter but still stunning spots in that area, drop me a PM
Kind Regards
Ian