does wide feet = larger/thicker dick?
No. Feet have gotten wider as people have gotten fatter, so there's some correlation with wider people in general. Bone structure in general has no correlation afaik, and there are plenty of whip lean skinny guys packing really big cocks.
No. Do a person's feet determine the size of their ears and nose? Same type of relationship.
I have large feet, a large nose, and large ears ...
A 75% success rate is nothing to brag about.