Have you tried one of Eric's tillering gizmos. This is where that thing shines. It will tell you where your limbs are too stiff and where they are bending. Another method is with a 6" ruler or straight scrap of wood. Run it along the belly and look at the gap in the center between the limb and the ruler. As you move out the limb, when the gap get wider, the limb is bending more there. Where it gets narrower the limb is stiff there. Give it a try and see how well you can see the differences.