PASM suspension problem
First up - remember when I was going on about fuel sloshing? Ignore me. Probably rear suspension fault.
Wallowing on road undulations on bends? - That also looks like it's more to do with the same rear-suspension fault rather than an inherant PASM characteristic.
If your car feels less than stable on twisties, you might want to consider that there is a suspension fault. Obvious symptoms are instability on performing a high-speed lane-change / elk test, susceptibility to cross-winds, vague steering feel mid-bend, general 'wallowing' on turn-in to a bend.
These things started off small, but have recently got almost dangerous for me. I would be interested in hearing from anyone with any or all of the above symptoms.
Car has just had rear PASM shocks replace and the electronics reset. This cured the behaviour for about 20 minutes. I am leaning towards it being either a sensor or a software issue.
Will keep you posted!