Yes, I’ve noticed mine is a little like that when regen is on full and cruise control is on. I suspect if I lower the regen level, it might be less jumpy but haven’t tried it yet to see if that is the reason
I’ve noticed it in my FE from day 1. It’s like the algorithm to put power on or take it off to adjust speed is too fidgety. A bit like a poor driver who stabs at the pedal or lifts off too quickly rather than making smooth anticipated adjustments to the pedal. It’s only minor but you can definitely feel it some days. I’ve never discerned a cause as sometimes I don’t detect it and sometimes I do.
Maybe there's a difference between cars. Very occasionally I notice a very slight variation but mostly it's very good.
I usually switch the regen to 0 so when I switch the cruise off I don't need to jump on the accelerator pedal.
I don't know about the EV, but on my PHEV there's a setting that controls the SCC response with (from memory) settings of Slow, Normal and Fast. To me Normal seems a bit too slow, i.e. if you're coming up behind a slower vehicle and you can't overtake, when you do eventually pull out it takes forever to start accelerating, Fast makes this a bit faster