My opinion on this is " Less is more " think the clay is dominant , a norrower band just to compliment would be better proportoned , but its just my oppinion
I always try and get a balance between wood and decoration the idea being that the colour band is sat on top of the wood and the plain band either side of it ties it in with the inner Bowl.
I dont really see how a thinner band would be an improvement but you might be right.
How do you see it the coloured band complimenting the wood or the wood complimenting the coloured band.
I would also be interested in how others see the proportions and whether they work as they are
Regards George