Blackfoot, I don't understand the logic of rotating a plant, even a houseplant. But especially an outdoor fruit bearing plant.
There are many evergreen conifers in the northern regions that if you study closely you'll notice something interesting. The south side of the tree has more leaves (needles, whatever) than the north side. Why? Because the south side receives more light, so the tree has optimized itself to put the leaves where they can do more good and produce more energy. Leaves are somewhat expensive for the tree to maintain, so why put them where it's shady?
So if you rotate your fig tree, the leaves that were on the north side that had grown accustomed to a certain level of shading from the leaves on the south side all of a sudden can't cope with the increased amount of direct sunlight.
So like you say, try to think of how the plant would grow if it were in the ground, which is the natural state.