I've run into a problem I can't solve. When I install a super or very soft tip (same for a soft tip), the tip will harden with less than 20 hours of playing time. I mean so hard I have to use a dead blow hammer to remove most of the tip. I then use a sharp cutting tool to remove the rest of the tip. I burnish the tip, but just with a little spit on a slow speed. I use new blades to shape the tip (also on a slow speed). I don't see how I am generating enough heat to melt the glue. Other installers have told me some tips (not going to name names, you know who I mean), typically run one grade harder than listed. This still shouldn't account for a tip hardening THAT much. I know tips can harden over time, but less than 20 hours of play! Any help would be greatly appreciated. Thanks.