Just my opinion but I have never had a muffler come loose on a new install using Loc blue with lock washer(new only) As you have experience, the total loss of bolts on not one, but 2 mufflers.......the threads are damaged.........so as you found out, only wire works after the damage is done.
Last on stock mufflers that have the deep hole and don't allow the use of wire........most people don't use split locks because they don't have the proper size split.............finding the proper size is not easy, unless you have vary good hardware stores in your area.
The photo shows how tight these split locks are if size proper....any larger and the locks won't fit down the hole.
My set up is vary similar to some posted hear..........I have split locks,blue loc....no gasket... high temp gasket sealer thin layer.....balanced prop. I have not braced off a stock muffler but I think it would be a good idea.
This has always worked for me.
Good luck
