RE: 1 pin
Very very few people can shoot 1 pin out to 35 yds and be as accurate as someone shooting multiple pins. Unless you're shooting a super light arrow most won't be hitting the same spot at the same point of aim out to 35 yds. If you want to shoot one pin, get one of the one pin adjustable sights. There are plenty out there that give the benefits of one pin and the benefits of having multiple pins/marks for multiple distances. I shoot a HHA Infringer, but there are many many others of these types of sites.