I understand the cruise control dance. I do it on both my Tesla and my Lightning. My solution, which works with both of my cars (notably, not a Genesis, therefore this may not work the same!) is just to accelerate slightly, deactivate cruise, drive as normal.

The Lightning would allow me to do it old school, it has a non-one-pedal-drive mode that has similar regen to normal engine braking on an ICE truck. But I prefer OPD so I just do the 'accelerate slightly and deactivate cruise' to get around the sudden slow down if I just turn it off abruptly.

> Perhaps I'm just getting old and now have bad reflexes!

Sounds like just a very aggressive throttle mapping. Not something I personally run into, but as with my earlier comment, this is very much going to be specific to the car. I also tend to drive with my toe at the bottom of the accelerator pedal which steadies my foot quite a bit and makes it less prone to bouncing on a bump.