Was the BRS/WWC Hybrid Method a Mistake? What separates the E-170's success from the 750XXL?

Why does the BRS/WWC Hybrid Method work so well on the Red Sea E-170, but still continues to be a challenge for the much larger 750XXL? We are working on finding out and the first step is to evaluate the differences between these two systems and find out where we went wrong. From there, we can hopefully identify the critical details that hold the answers we need to kick our 750 XXL into high gear.