Unfortunetly, I'm still not sure dictating a minimum weight will actually cure the problem.
I don't think Arthur was suggesting that it would cure it, and I know I didn't. It's a step in the right direction.
I did an experiment today with my bow set at 66 lbs. I shot 20-391 gr arrows from 20 yds and 20-520 gr arrows from 20 yds. This may surprise you and the others here. But the 391 gr arrow's averaged penetration was 18.75 inches. The 520 gr arrow? 16.75 inches. That's 2 more inches. If people would like I'll keep track of this each time I shoot until I reach 100 shots with each and post. All shot at compressed sawdust particle board sheets.
Believe me, I don't want to soud disrepectful, but there are simply a host of reasons this might happen, and not indicate which will penetrate furthest on an animal. First, arrow tips must be identical shape and size, arrow diameters must be the same. They also both have to have perfect dynamic spine while being shot out of the same bow, and they should have the same percentage FOC. Here's the big one - the medium shot into, has to be of different densities which will tend to deflect the arrow. This is what happens when an arrow hits the edge of a bone or at an angle. The forces of defection have to be resisted. Heavier arrows will always resist these forces best. High FOC arrows will deflect less than low FOC arrows. This is the primary reason why tests into plywood and steel drums might be a good indication of broadhead strength, but have no real bearing on penetration potential in an animal.