Standard RTF is the best way to be understood, that is the whole point of it. It has helped me out on numerous occasions with pilots with a heavy accent (and of course to them I also have a heavy accent!). Not only that, but it makes you sound like you know what you are doing and therefore you're more likely to get what you want.
Not sure if you were trolling or not, but "over and out" most definitely is not in any publication. It means "my transmission is ended and I expect a response and my transmission is ended and I do not expect a response", which is obviously nonsensical.