Well to be honest that is the main reason for eating isn't it?
All the rest is treating food as either entertainment or reward.
Some may think thats a good thing.. I found it got me into lots of trouble and ended up here..
However, it seems that no-one so far has tried the raw potato starch with any degree of success. I'l just have to bite the bullet and give it a try, meter at hand. I'll report back with the results.
If you are experimenting, rather than resistant starch, how about reducing the amount of starch in the potato? I remember making rösti potatoes, when they are grated and squeezed, loads of starch runs out. I haven't tried the effect on bg myself as I have given up potatoes, but I would be interested to know if it makes any difference.