I'm totally in for bouncy suspensions but the current sway has nothing to do with that. It just feels like you're sailing your train over the atlantic while there is no change in sway whatsoever, a constant curve that is being looped all over. Best noticeable in the modern pendolino as the banking angle is enormous but pretty slow, while it's a higher frequency and not as prominent for the older trains.
For now, a simple option to adjust the amount of sway you want to see (0 - 100%) would be necessary (imho) until there is a more in-depth solution to that.
Otherwise the physics are great and I love it, but that constant cab sway is annoying me for the entire duration of any trip with any train..