That may be the Hemi type sport feel ??
My wife has the Jeep GC Laredo 06 and I always thought it drove like a truck but it is really bad now. only 65K I am replacing the struts/shocks feels like we are riding on the springs w/o any dampening.
I will never be happy because I want a luxury car ride but I will never get a luxury car (not practical for us). I am shooting for content with the ride for an SUV??
It sound to me like you are riding on the springs without the shock dampening??? Maybe you got bad shocks or the factory put the wrong size shock in place for the BIG Overland edition?? sized for the compass/Liberty??
Over inflated tires would add to this but not be responsible for it completely? Do you have a low profile tire? A higher profile tire will absorb road shock better than a low sport tire will. Also a tall tire will introduce some bounce into the car depending on situation...... It is directed to the springs/shocks and if this setup is not correct you will feel it more
I am no expert here just my backyard mechanic ability tossing out possible ideas
hope you get it worked out to your liking.