Let me give some examples.
A lvl 33 archer could have the following wpf archery/1H:
175/76, 177/65, 179/50, 181/29, 183/0
I kind of like the idea of having some wpf in something else than archery but how much difference does those last extra points give. I guess playing around with STF can give some indication but you can't really get that high values with a 6 PD bow...