reiko,
No offense but when I read the original post my first thought was, "Anything but Speedplays." 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.
But then, you have new Speedplays that you like and I have been on Looks since they came out...