How much improvement to honey production do you get when you move bees right on top of great forage?

Good year for sweet clover here. I have 3 yards within a mile of good clover forage and one yard that I moved right in the middle of a half section of a dense clover field. Wondering if it's worth the effort to relocate more hives closer to the source? Yellow clover is peaking, the white clover blooms are about to start. And, it's not real easy to move hives right now as they have supers full of uncapped honey.

How much difference does distance make to the forage source?

Thanks. .....Don