I really don't know about the speed nock. Never had to fiddle with such things. Adjusting the peep so it rotates perfectly square to your eye everytime is a pain in the neck and it can be a real test of either your patience or your cussin' vocabulary - or both - but it's very much worth the time and effort to do it.

Even the guys who use the rubber tubes SHOULD adjust the peep to rotate right. The tube shouldn't be there for anything more than insurance. Most of 'em though have the rubber pulling so hard on the peep to get it aligned that it torques the string and causes tuning problems.