Mario,
Very nice video of your model flying, it looks to be very smooth in all aspects. I did play around myself with teetering heads back in January of this year, I managed to make it fly, but like you for it to fly smooth I had to add dampening to the teeter. On my larger model the teetering is free and undampered and this flies very well indeed. I will make a small teetering head for the little gyro but I think it will end in disaster so for the time being I will just enjoy flying it!
You have probably seen these videos, the first is the first trial of my teetering head
www.youtube.com/watch?v=fxPxKqnJIUk
The second video is just a quick flight using my standard un teetering head
www.youtube.com/watch?v=N9K4WVO2Qzg
Keep your great work, it is nice to see other like minded people having fun!
Regards Rich