We have discussed the pitch method ine the forum.
For me this method can be usefull only if you compare several blades of same model at one and the same place and time and ball.
Comparing blades of different models of same brand, or same construction of different brands, may give true or wrong results and can't be trusted.
Comparitive tables, made of results from people and places all round the world and with all different balls /just look at the balls threads/ can not be trusted at all.