I have no problem with longer bows if that is your thing, but to just take a certain design and lengthen it waters down the mechanics of that design.
If a bow is designed to be the most efficient at 28"s, it can certainly be shot by people with longer or shorter draws, but it becomes less efficient. This is why bows feel sooo much smoother as they get longer. They are not being drawn or worked to their potential...no problem but then don't ask for the fastest.
If I were to design my Thunderchild (currently 54",56",or 58") to be efficient for the same draw length but make the bow six inches longer (60".62",64" ...i also have other sizes) It would no longer be the same bow, but it would be my Buffalo model.
There are no magical fromulas, it is all physics and geometry. The human factor is what confuses everything.
Shoot what gives you the warm and fuzzy. This will help confidence and is more inportant than every ft per sec or any other adjective or factor.
What works for one doesn't always work for others.
BigJim