==> The -df is deleting the files after acrhiving, but it is not deleting the folder that the files live in.
I think that is true. I believe there is a command called M (rather than A you are using) that moves files to the archive and may delete the folders too, but I haven't worked with that so you will have to experiment. More info in the help file on that.
==> I also need to add overwrite existing files which I believe is o+?
Yes, that is -o+ switch.
==> If I wanted to add archive comment would that be c or -c ?
It looks like you either do that in a separate RAR command with a C, or can do it with the current A command using the -z<file> switch, more info in the Help file on that.
~bp