you are right those light arrows are the reason they get their 350 speed but i can tell you for a fact that i have a carbon 4 runner extreme and just bought a new bowtech mighty mite and can shoot the same carbon express 300 through them both and the high country smokes the mighty mite but the mighty mite is smoother and has less vibration and that is with the same draw length and the same poundage. so high countrys are pretty fast with out those light arrows.