I solved my boom bounce by adding a bit more torque to the elevator hinge bolts. I had to go beyond the recommended value. My IA didn't want the compression on the bearings but in the end the smooth stable flight characteristics were persuasive. Check for even the slightest play and eliminate it. If you can't find anything try a bit more torque on those hinge bolts a bit at a time.
Best of luck
_travis
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