I've noticed it is weaker since the last couple of updates. I have also found that if I switch from "High" to "Standard" then back to "High" regen it changes the behavior to be more aggressive with the "High" regen. It's almost like the truck is defaulting to a softer version of "Standard" regen and toggling modes resets it back to "High".
I've noticed I don't get full power a lot more as well. Kind of annoying its not like an ice where you have gauges that tell you why your engine ids not running optimal. You just accelerate then notice the bar gets locked out at the top.
i did notice it seems weaker. i found myself wondering a few times if the vehicle was going to stop and it seemed unusual from before based on distance and speed (on flat surface).
i';l try the trick of switching from standard to high. wouldnt surprise me if that does something. lets face it s/w is buggy and Rivian is no exception.
To me, it seems that the peak stopping power is nearly identical to previous software releases, but it 'kicks in' much more gradually, increasing stopping distance by quite a bit.