[SSLance]

I'm assuming you have coilovers front and rear because you talk about pushing on the rear bumper. Can you tell if the harshness is coming from the front or the rear?

I would suggest the following to see if it helps before start to change out any parts. Soften rebound up fully, knob all the way counter clockwise on all 4 shocks and lower the air pressure in the tires some. If at 32 psi, lower down to 28.

Then test drive over a road you are familiar with and see if it makes a difference. If it's still harsh, to you...try to determine if it's coming from the front or the rear. Do you feel it in the seat or the steering wheel?

I've found everyone's ride expectations and sensations are different as are different cars as well, the nice thing is this setup is very tunable to your taste and preferences...you just have to decide which way you want to go.