When i read those number it seems that they are all very close to eachother.
Little differents in setups makes little changes in speeds to.
I found out diffence in braceheights to be the diffence in speed calculations as well.
Therefor its handy to know what your bow delivers exactly so you can calculate exactly what arrow you should use and what the amount on kinetic energy will be.
At least, I allways like to know that.