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@36x18
In the early 80's Honda brought out a motorcycle, can't remember which one, that riders complained about because it 'wobbled', or 'tank-slapped', when you took your hands off the bars. Their response was "why are you taking your hands off the bars". The idea is that 'quick' steering trades off with some degree of instability.
Mdcct clearly knows more about the physics, but my 2p would be to see if the motortrade rule of thumb works. "Too loose, wobble. Too tight, weave". Tweak the headset a little tighter, and if no different, then looser, to see if it has an effect. In my limited experience you either can or you can't ride a bicycle with no hands, but I've never got to the bottom of it. Always assumed it was a trail/weight distribution issue, but tyre type, pressure and condition play a part on a motorbike, and may have some bearing here.