Wayne, If your arrows are at or in the neighborhood of the weight stated I don't think the problem is arrow weight. (There are many knowledgeable people who shoot the skinny carbons because of their ability to penetrate so well)Obviously some of my peers would disagree and certainly they have every right to. I don't think the debate over arrow weight vs speed, Kinetic Energy vs Momentum, will ever be settled to everyone's satisfaction.

Again if your numbers are correct I don't think your set up is the problem. I think it boils down to shot placement. Take the wind out of the sails and the boat stops sailing in short order.