I would really have to agree with Cyclone in most cases.

There are pro's and cons to having a fast bow or quiet bow.

But, my opinion is if a deer does jump the string at 25 yards, I would rather have a complete miss than a wounded animal.

StrightArrow - you keep using this gravity force as such a big piece of your puzzle and you are missing a lot. Yes, a deer can crouch faster than the force of gravity, because there is an outside source other than gravity being used namely the animals muscles.