I can't fit the enamels over my hand either. I have been wanting so badly to be able to wear an H enamel. My SA also explained that some people can "collapse" their hand more than others and hence the bracelets slip on more easily.
I love your narrow and wide Boucle Sellier - they are both gorgeous.
To get on tight rings, I wet my finger. Perhaps this would help with tight enamels, Maedi?