To get equal throws, you must set up the control so that the servo arm is perpendicular to the pushrod when the control is centered. As far as the control is not binding then it won't harm the servo, but if you can try to adjust the linkage to get the servo closer to perpendicular then you would be better off performance-wise. One thought would be to pull the servo out and install it facing the other direction - maybe this would allow you to better adjust the linkage.