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i think there is something else behind this. JK's suggestions comes actually from CY (read his 1996 article about gyro for 3D). And this is about giving more gain to the servo, vs. gyro. CY talks a lot about the two gains (servo arm length, etc).
Whatever it is - i just use 105% on both sides. The Lmt does (i believe) affect the feel of right or left, the ATV does that and other parameters.
here is a part of CY's article :
The term “over-driving” means the servo can put in
more control than the gyro, at high turn rates. With
the longer arm you will have to turn the gyro down
some to keep the tail from oscillating. But, it should
still hold as well as a shorter arm with a higher gain.
And the maximum pirouette rate will be increased.
For the over-driving to work, set the travel adjusts
as high as possible (150%). This will result in the
tail pushrod jamming and bending at full control,
but in flight, the gyro does not let this happen. The
reason is, when a large
control input is given for a
pirouette, the gyro will take
out a percentage of control
input in an attempt to stop
the pirouette. A fast pirouette
results when there is more
control to cause the
pirouette than there is gyro
to stop it. This is done by
making the gyro control a
smaller percentage of the
total control by using a long
servo arm, using full servo
movement and turning the