....achieving penetration at the spot you are aiming at requires a certain quality of accuracy first- this is what I'm focus on (by training and setup) - the momentum my arrows generate I can calculate precisely, and it is more than enough acc. to the Ashby recommendations (strange thing, when it comes to these kind of discussions lots of RF followers say ,,,"...
yes, but Ashby said..." and then I tell them that my momentum is actually more than I need acc. to Ashby ....but that doesn't matter, for them it is still not heavy enough

...go figure...)