RE: Heavy arrow, more KE....light arrow, more speed..??
Fair enough Tfox. And yes, I believe some people need more foregiveness than others. I should have said the amount of forgiveness depends on the individual.
Mechanicals are all I use. Hunting elk above timberline with constant swirling winds educates you quickly on the use of fixed blades. Again, there are just too many variables in this sport to say this works best or that works better. Practice and first hand experience becomes priceless.