Another way to improve stereo width (and I think you were trying to get to) would be the concept of double tracking - recording the same performance twice and hard panning the signals left and right. If you're doing this with a singer or a person playing guitar, the minor inconsistencies between the performances will change the overall signal enough so that when you play them back at the same time with one in each speaker, you get this very wide signal that tickles your eardrums.
If you're using a synthesizer (especially a VST plugin), you can simulate that effect by removing certain oscillator retriggers or otherwise enabling a free-flowing oscillator, then recording the signal's output twice and panning them like normal.