Hi Jesse,

I really don't think you'd need to change anything.
The only thing worth considering at some point is having some more of the larger finger sizes.
But that's more of a personal thing because most of what I do is in the bigger size range.
That's sizes Z through to Z+10.

Here's a Ring Size chart that matches pretty close to the Mandrels that I use.
http://www.celtarts.com/ring_size.htm
As you'll see, their sizes are very close to yours.
And this page is handy for those larger sizes.
http://www.celtarts.com/large.htm

regards Colin