A bad day at the flying field...
Handsfarm: not familiar with that plane but there are ways to stop the flutter. Instead of using wire across the elevator halfs, I use aluminum tubing grooved into the front of the halfs till they are flush with the LE. Wrap 6oz glass cloth around the front and onto the elevator about 1/2 in. Build the elevators as light as you can. What are they made of, Like how thick?