RE: Are some planes just really tail a or nose heavy?
In short, Yes. A lot of times it depends on the length of the nose vs the tail of the airplane which may cause lead to adding a bunch of weight. A good example is the Hangar 9 Sopwith, it actually comes with a slug of lead to put in the nose for balancing! I have never owned a Kadet, but the three Sig planes that I have do not need any lead to balance...