I know some will disagree, but from what I have seen and heard using a leader long enough so that the knot has to pass through the guides on a spinning rig has some definite drawbacks... particularly the ones you mention. On a conventional, not a problem. However, on a spinning rod, because of the guide layout and the strain as the line passes through the guides as the is unloading during the cast (and the rod is bent under load on retrieve) will eventually cause the problems you mention.
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