Little experiment to try and remove some of that 'tinny' sound in the G400 Max. Some sound clips here... https://www.youtube.com/watch?v=haf0W6soExk but not the best due to variable range noise and use of phone camera. Gives you and idea using a variety of strikes.
I put 3 metres (~10 feet) of regular wool/yarn in using a skewer. I've keep a tiny amount threaded under the screw so it will be easy to remove when I need to. Haven't really noticed any difference in swing weight, although it's there, coz you know, physics. Took about 30 minutes all up... was really quite easy. Just had to shake the head every now and then to distribute the wool/yarn.
To my subjective ear and feel, it's a subtle improvement on anything but centre strikes. When I do flush one (rarely, hence the use of the Max) it sounds and feels much more solid than stock. I may experiment with another 5 feet and see how it feels.