RE: Flutter problems and Mechanical linkage Setup Lesson Learned
With your radio set to 140%, and your mechanical linkage giving you the high rate you want, you can then use the dual rates to lower your throws down to a normal flying rate. Dual rates won't change your resolution like ATV's will.
Don't get fixated on the 1 to 1 relationship. If you can get the throw you need with a 3/4 to 1 (servo arm to control horn) relationship then do it. Any time you can move closer to the center of the servo you're increasing the leverage at the surface. My precision setups wind up at a ratio of about 1/3 to 1 or less on the elevator giving me only about 15 degrees of throw on high rate with ATV's maxed out. You really can feel the lack of slop and increased servo precision on something like this.