RE: question about arrow weight and speed loss
Tom Crowe a long time 3-d pro shoots ASA with an 80# bow and will setup the heaviest arrow to get 280 fps.
The whole reason is to get as much momentum as possible.That is why he uses 80# and shoots a heavier arrow.
A 60# bow will not yield as much momentum shooting the same 280 fps.Provided they are relatively the same in ibo ratings.