I don't even understand the logic with loosening the tension. If the posts were that soft, wouldn't they also develop flat spots from sitting in one position too? It reminds me of when people say you should loosen the strings on a guitar that's in storage and doesn't get played often so the neck doesn't warp—how is the tension any different if a guitar is getting played or not? Wouldn't all the guitars you do play often have warped necks if that was the case?