RE: Speed vs quietness, what's your priority?
I prefer a heavier slower arrow. It gives me better momentum and seems to be more forgiving for me as well. I shoot more accurately with a slower arrow vrs a fast one. However my bowtech is pretty quiet regardless what I shoot out of it. I can shoot heavy arrows at around 200 fps or really light ones with the poundage turned up for around 260 fps or so (which is fast for me) and it is just quiet. Like Arthur said, you can hear the loop come off my release a hair before the arrow hits the target.
I am actually pretty happy with around 230 fps. If I had a bow that would shoot faster I would probably weight my arrows down until I got to that speed and utilize the extra weight. I don't shoot 3-D though. Every thing I shoot is at known distances, even hunting.
I think the key to deer jumping the string is shooting relaxed deer. My buddy has an older bow that is loud and slow and he has no trouble killing deer or having them jump the string out to 30 yards. You just have to pick the shot is all and know when to draw and release.
Paul