Brass was just more "apt" to break. I have never run them just out of fear. But you and your dad run damn hard so if there still there well...I dont have a good answer.

The liberty fork has a thick flange on one side vs a shallower flange on both for the factory piece. The face plate slider is also much "bigger" in diameter than a pro shift setup so you dont have the room on the slider side like factory.