I'm with you Jazz.
I'm a size 11 foot aswell!
(female. xD)
I've got a stupidly narrow and very long foot. Extremley hard to find good-fitting shoes.
I found I needed to go to 'Sizeable Shoes' which caters for the longer foot, but they moved to this tiny little shop in Bondi Jnct, and they're awfull now. They used to have a few good shoes, but okay- now they're all horrible ugly old peoples shoes. xD Honest. Awfull! Now I usually just have to hunt around for a pair of shoes, so for a pair of heels- it takes me like 5 hours to find a pair that actually fit. xD Hahaha. I hate it! xD But ahhh... That's our feet for you.
The last place I got some good fitting shoes was ummm.... Country Road- for ballet flats, and Marthas Shoes. (Although they can often be wider sized)
You really just have to try out alot of places until you find what you want.
That's the way it goes unfortunatley!