I did a sucker crop one year (I can’t remember what year but it’s in one of my grow blogs from about 7 years ago give or take). If I remember correctly, the timing of allowing one of the bottom suckers to grow just before the harvest is completed on the main stalk is crucial. When the harvest is completed on the main stalk, I cut above the bottom sucker and let it grow. I believe I had some plants even throw out 3 suckers, however, one sucker is better so all the energy goes into those leaves.
They may not be the same leaf quality as the first main stalk harvest, but done right, it gets very close to it and can increase your overall yield by more than half again.