I put together a database this past summer comparing actual sizes of Vibrams of varying sizes, colors, models, etc. It's described (and linked to) in this thread:
http://birthdayshoes.com/forum/fivefingers-sizing-and-fit-discussion/vibram-measurements-database/The list does not include the width of individual toe pockets because I couldn't come up with a reliable way of asking people to measure and report them .. but it does show that there is a good amount of variability in all dimensions between Vibrams of a given size/model. So it might be worthwhile to find another pair that are the same size & model to see if they might be slightly wider.