WoWa woppt/hoppelt

Hallihallo, finally, we have been the proud owner of a WoWas for a week. It’s a hobby 400 from 1979, so fresh in dew looks still super good and has new TÜV and gas. When driving I find out again and again that he (especially with slight unevennesses) quite wigs behind, and that around his axis (the with the wheels ). It feels as if the dyke is yielding or springing, which is hard to imagine with the material strength and the good condition. Now it is could it be that so far the support load was simply too low and therefore he hopped so much? I heard more than once that the support load should be important for driving stability. Greetings, Oliver