It's not too wierd that too wide handlebars could cause problems! I'm more suprised that you don't have neck and shoulder issues too.... I can totally see how you'd be stretching your hands out if you are that far out on the bars. Go for some smaller bars - they aren't that expensive and you should be able to find down to 38's without too much trouble - you may have to ask for them to be ordered if your shop is small though. I think some brands may even have 36's.