RE: Cock vane up or down?
One of the major benefits of shooting a drop away rest is not having to look when you nock an arrow. If you need to nock a second arrow or nock one quickly you do not need to look at your string and take your eye off the deer, elk or what ever.
That is the point of experimenting to make sure that there is no fletching contact with different fletching orientations.
Another point to a drop away is that there is no set way that an arrow needs to be orientated. Some people like the cock vane up, some down, and some out to the side. If the rest is working properly then a person can shoot any way that they prefer. There is no one specific way (cock vane down) that the arrow needs to be nocked.
If you like to shoot cock vane down then by all means do so but the original question was which way does the cock vane need to go with a QAD ultra rest. And the answer is thet there is no specific way that it needs to go. That is the entire point of what I posted. He isn't shooting a TM hunter rest that requires a cock vane down orientation.