I asked a friend that is more savvy with carbon arrows than I am, he suggested Zwickey Eskimos mounted on steel broadhead adapters, cut to to a bit longer than I would have thought, 32" to start with.. Which I would agree with the Eskimos, they are priced right, they fly out of anything and nearly anyone can get them shaving sharp. However, according to the Stu Miller program with the 75 grain steel adapters a 125 grain head on 3555s they have it cut to 28.5" to match your Viper at your draw length. If your release is softer it would need to be longer than that with 200 grains up front.