1) My bones very strongly shiver how to correct?
2) How to make that the bone after movement returned to initial situation? Didn't hang.

QC-file:

$jigglebone Ear1_R {
is_rigid {
length 20
tip_mass 15
angle_constraint 30
yaw_friction 10
pitch_friction 10
yaw_constraint -30 30
pitch_constraint -30 30
}
}

$jigglebone Ear1_L {
is_rigid {
length 20
tip_mass 15
angle_constraint 30
yaw_friction 10
pitch_friction 10
yaw_constraint -30 30
pitch_constraint -30 30
}
}

$jigglebone Ear2_L {
is_rigid {
length 20
tip_mass 15
angle_constraint 30
yaw_friction 10
pitch_friction 10
yaw_constraint -30 30
pitch_constraint -30 30
}