Hi Michael,
Setting the gyro limits down to control piro rate is going to produce some undesirable results. It will set limits on the physical travel of the tail servo. This will limit the authority of the tail in high demand maneuvers like climbouts and 'oops' collective grabs (the time when you least want tail blowouts). And it will only limit the piro rate after the servo has traveled to the limit.
Instead, bringing in the end points on the transmitter reduces the max rudder input that you send to the gyro. This is an effective way to reduce piro rate. Just like bumping up the end points to 120% is a way to increase the piro rate. The reduced transmitter end points mean that you never tell the gyro to spin as fast. But you still leave the gyro with the ability to give larger rudder inputs to properly counter the torque demands from the main rotor.
Keep the gyro limits set so that the tail mechanism is just short of binding at each end of travel. And adjust piro rate with transmitter end points.
Vince