Your in fine shape , if your arrows all hit the same spot . Chuck adams had a great artical on this , know your range and where your arrow is going , a faster set of arrows that arnt as accurate are a big disadvantage . Speed does not equal accuracy . Use a cut on contact quality fixed head and you will be fine , make sure its scary sharp .

Straightarrow is right on .
Ive seen Ted Nugent kill a moose at 50 lbs draw , and a zebra at 55 lbs draw , with magnus 2 blade heads , nither animal went 100 yards after the shot .