RE: Feathers vs. vanes
I don't think so. It's called jumping the string because they react to the sound of the bow. If they can see you, they also react to the movement. I think it's likely that an arrow in flight sounds like another fly buzzing their ears. If they hear it at all.
I keep hearing people say vanes are quieter than feathers and I simply don't believe it. Maybe someone who has a decibel meter could test the hypothesis for us. Put the meter 20 yards downrange, where a deer is likely to be,and shoot towards it. I really wouldn't expect to see more than one point either way between feathers and vanes.