KE& monetum are maintained longer with a heavier arrow. Therefore, at a greater distance the heavier arrow out of the higher DW bow would have an even wider margin of increased KE & momentum. You can calculate what the KE and momentum would be at any distanceby chronoing down range if needed.

I read a good article on this issue that I'll try and pull up from one of my 50 magazines sitting by my TV and post it if you are serious about getting an answer to what the difference would be at 20 yds?

This is my opinion and mine alone. Does it meanI would think of you any diffrently no. We just have a dissagrement on that issue. I didn't speak my mind to start a fight and you asked me & I try to as honest to people as I can. The thing that matters most is howyou feel about what you shoot, not me.