I too have wide shoulders and yesterday my elbows were screaming horribly after 60 km. I thought I'd get used to the position after a couple of rides (I am new to road biking) but after 500 km it's still the same, so no. I will be going into a positionning session next week and figure out what may cause this. I suspect it either handelbar width or the fact that I have to bend forward too far (and thus will have to raise the handlebar a bit or get a shorter stem...)

I'll keep you posted - I know how much it hurts!!!