Almost since the Xcalibur began the reactive resin revolution nearly 30 years ago, such balls losing their power/reaction/hook over time has been an issue. In some cases, that power loss can be accompanied by cracking of the coverstock, which is something that impacts every manufacturer.  Over the years, there have been so many theories advanced for the reason(s) that I don’t think I could recite them all. Some theories focus on the cracking, with recommendations to rotate your...