Scott,
I also use tail and secondaries for my Eastern Two Fletch...My opinion is that they are quieter in flight on this style because of their softness... I started using this style exclusively because they were easy to tie...I also noticed even when the quills are soaked in water and then pulled tight you would hear a light humming in flight due to the quill vibrating against the shaft...Since I don't use glue, I now take a sinew thread and tie the quill down at the halfway point...This is the quietest configuration for me to date...Here are some secondaries tied up, "right wing" 90 degree helo...Look close for the small sinew thread tie down...
Don