Depending on the age of the airplane there were different rules for certification. Prior to 14 CFR Part 23 there was no specific weight used to determine Vmc. After Part 23 was in effect it is at most unfavorable weight and CG.
That is probably what you are wanting to know. There is also a difference between controllability and performance. More bank towards the operating engine equals better controllability but may not mean that you have the best performance. The zero sideslip condition is the best for performance which in a light twin is important because they don't always like to climb or maintain altitude.
