I'm just thinking that with feet that long there will be some flex in the shoe, regardless of how rigid the sole, and a big platform under the show would help. I was thinking that a Look pedal would be more appropriate.
I agree. Even with size twelves I find it difficult to use Spd's. I went from Looks to SPD's and now I am back to Looks. It is hard to beat that large platform for comfort.
Of course if you are going to do a lot of walking in your cycling shoes, you may want to try the smaller platform pedals.
My five sense worth.