Originally Posted by DRR
Just realised I'm being stupid - I thought I was working with a mono track but it was actually stereo. Of course L + R = stereo centre.
the idea of double tracking is to record two different versions of the track, then layer them over each other. sounds to me like you used the same track on both channels.
if you only have the one take and cant record another you could apply some effects to either one or both sides to create some subtle changes.
some very small pitch changes would be a great place to start