Problems building a shoe sample

Hello All.

I dont post here much, but thought I could give it a shot to tap this resource.

I’m working on a flexible shoe along the lines of the popular free, tubes, realflex etc. The samples we continue to get seem to encourage overpronation. Are there any tips that will help avoid this? Is there some way we can alter the last, change the landscape of the footbed. Etc?

Any thoughts would help.