Crap user name, I know.
I used to use a 18.25oz EP with a 4.1oz shaft but it also works nicely with lighter shafts. theres no lack of power and a lot of people could not believe that it was that light. These days i favour the heavier cue because my stroke has become more compact and my style has changed significantly but i do believe that the weight is just a number. other factors like weight distribution and flex (stiffness) etc are more important..