Pro Comp springs ssuck. They are to stiff to even try to find out. Some people claim they are better when used as SOA. I also wouldn't try to remove a leaf to make them softer as it will make the spring weaker, they are alraedy pretty weak, I've bent two. They also seem shorter than normal on my YJ, they are causing almont a negative shackle angle which ads to the flex problem. Like I said, they are trash, find somthing else.
Only 5 more day till I toss mine and go SOA.