I was back in town today and as it has still been niggling at me I decided to get them to switch the ratio from 4/7 to 5/6 instead.
Clasp-wise, it probably actually did sit better how it was originally, as now its a little too far round my wrist the other way, but in my head at least I know its more even! Will keep it like this for a little while and can always just change it back myself if its annoying me.
I've bored myself with it all now, but its funny that its something I've never encountered before!