Like Charlie, I love tapered shafts from Hill bows. They seem to fly like lasers. Parallel are fine, but I perceive a difference.
Another solid reason to shoot tapered shafts, when you order them, the best shafts are often used for tapered shafts, they are straighter, with good grain, because when they run a crooked shaft on the taper machine they would get garbage out. This means less straightening and more attention to weight groupings as well.
I think I'll be making some strings with tiny loops, I've made some, guess I never really noticed any difference.
I've noticed bowyers are cutting the string grooves more shallow all the time, I'm unsure if padded loops are even necessary anymore...my most recent bow had the padded loops protruding from the side of the bow. More apt to get rubbed.