Ah ok mate, yeah those settings were for 1920x1080 resolution only.
Is the native res of your tv 1280x720 then? We have another screen in the house that is not full hd and it's resolution is 1366x768 (or something). Also the tv will need to have some sort of 1:1 pixel mode turned on. I think on my Sony it's called "full pixel" or something.