RE: Heavy arrow, more KE....light arrow, more speed..??
I shoot a 475 grain arrow. I may switch to the 140 grain Montec next year. 490 grain arrow
IMO shoot the heaviest arrow you can, with todays bows speed is not a factor.
I am still shooting around 250 FPS
I am 11 for 11 with this setup, 9 were pass thrus. Two buried in the opposit shoulder.