Perspective is everything. If it was me, I'd be concerned about beign so light. Your worried about speed, which is completely unimportant. Accuracy and penetration are all that matters. Heavy arrows with a high FOC and good drag on the rear can be shot very accurately with a broadhead attached. They also penetrate better than a light arrow. Know your distance and shoot with a truely heavy arrow, and your setup will be more than adequate for elk.