I have what I would consider 1 heavy draw strop and one fast strop or light draw. I agree with the fact that the heavier draw strop is pressure sensitive, I have also found that tension plays a factor. If I am a bit lax while using my heavy draw strop it gets really difficult to get a smooth stroke, but if I put a extra bit of tension on it then it helps a lot. As far as if it is actually affecting the edge? I guess I can not see how it is aside from what we know a strop to do which is align the edge, I don't believe it to be stretching or pulling the metal. JMO