I have tested the dampener for at least four hours per week for the last eight weeks. Other than the type of slight shifting around that one would expect from a commercial dampener, it has stayed put. Time to open a custom dampener printing service or something.
I just tested her out for about half an hour. It didn't budge, and it absorbed vibrations at least as well as the Vibrex dampener I had on there before. It also didn't seem to split any more, which is good because the slots are cut along the grain of the layers.
Now we're scheming to slap a piezo on the thing and wire it to a microcontroller attached to my wrist.