The simple answer to this quite common question is “it depends largely on the defect(s) you are trying to avoid.”
If you have no tightness-related defects, nothing need be done. If you have a tight defect, then back off. If you have a loose defect, then crank it up. However, that presumes you know your defects very well.
For example, there are three kinds of core crush, two are tight defects and one is a loose defect. There are six kinds of telescopes, some are tight, some are loose and one is a taper defect. So, your choice of curve or taper would then depend on which specific type of core crush and which specific type of telescope you have on a specific wound roll.
Also note that you can have tight and loose defects in the same roll, same set of rolls or under the same winder settings. In short, the best winder curve depends on how well you understand your specific defect mix and the limitations of your web and winding machine.