Also 15/15 is not a very extreme duck, you may even find comfort going wider like 18/18.
Canted or not and stance width also will affect you.
Is the pain in the outside of your front foot? Try moving your bindings apart 1/2" at a time. Just a little can really alleviate this pressure, especially with canted bindings.
Good bent knee athletic stance helps, arthritis, not so much