Buy filters without a metal-to-metal "seal" between the leaf spring and end cap (ie, filters with fiber end caps), or filters that use a coil spring instead of a leaf spring (like many of the Premium Guard made filters). That's how you get around the possible leaf spring leakage path.
The OG Ultra never had this issue because they knew how to stamp a smooth leaf spring back then, and the OG Ultra also had a fiber sealing gasket embedded in the metal end cap. Fram knew how to design and make a filter back before First Brands smoked them. Filter makers (including even Champ Labs) are getting sloppy with manufacturing these days to cut costs and make profits. The must literally be farming out those leaf springs to 3rd world manufacturing companies with dirt floor shops.