Try riding at 23. I didn't get a numb foot riding my same stance width with canted footbeds, but it did feel off. Running a half inch wider made all the difference.
The canting just needs to be appropriate to you leg length and then just needs to match up with your stance width. With your leg length it just sounds like 22.5 is too narrow for a 2.0. Wider will take the pressure off the outside of your feet.
If that doesn't work you might just not be shaped right for canted footbeds. Freak.