RE: Cock vane up or down?
Bigbulls is correct andcouldnt have made it any clearer.
It DOES NOT matter which vane/feather passes through therest. If you want to make it the cock vane, go ahead, if you want to make a hen fletch go through, go ahead, if you want the cock vane up....GO AHEAD!! Just MAKE SURE you dont have fletching contact. Doesnt matter what kind of rest either, they all need to be checked for and eliminate any fletching contact. (except whisker biscuits and the like)
Also,most drop-aways(if setup properly) should still be able to get out of the way of even the fastest bows. In most cases they are "dropped"by a spring, and the bows forward cable movement. This ensures they are out of the way by the time the fletchinggets there.They are not actually "dropping" but being propelled downward.
Bottom line is, check to make sure you dont have fletching contact (no matter what rest you use). Then orient the fletchings/nock to allow the best clearance possible. Then make sure they are all the same, and shoot.
Have fun---Matt