Hey Jess,
You're just like me. I'm 5'11" and also wore size 13 shoes prior to transition. The weird thing is that when I transitioned, I ended up wearing size 13 womens. Which really sucks, but which is better than a higher size. I wear mainly flats or other shoes that minimize my feet. I don't get anything more than one inch if I wear pumps cos I don't want to look taller.
I always feel self-conscious of my feet, but I still pass fine. Something funny happened earlier this year that made me think about this. I was going somewhere and a friend was picking me up. He's known me for over ten years and he doesn't know I'm trans. I was wearing sandals, which I don't normally do, cos they are more revealing of the feet, and I don't like how they look. As I got into his car, he saw my feet and he said, "My goodness Traci, your feet are so big! They're bigger than mine!"
He had never noticed them before, after all the years he's known me. It also didn't change how he views me. I'm still the same Traci I always was to him. He simply said, "Oh I guess it makes sense cos you're tall."