So I just got done installing my coilovers the other day and I noticed when I come to a stop the car doesn't quite settle it kinda rocks back and forth more than it used to and then settles. I'm not sure whether this is just me needing to stiffen up the back or make an adjustment. It just feels kinda bouncy in the back but the front feels good. Any input would be very helpful or just point me in the right direction thanks in advance

 

tighten it up in the back then see how it feels.

 

More rebound on the shocks.

 

On any new suspension install, start off set to full soft at all 4 corners and test. Adjust upwards until you get what you want. Keep in mind however that you've just installed a setup that uses much stiffer springs then oem, you might have a misconception about what they can deliver ride and drive wise. You may never find find settings you really like. I just don't see the setup having the valving range.

Stance GR+ Monotube, adjustable damping, full height adjustablity
Spring rate true coilover* version 672/280* (*='s about a 672 spring in the oem rear location)
Spring rate oem style rear 672/616
Side note: Well liked on my350Z, most popular with the "drop it to the ground" crowd, several have been pulled and resold because they did not deliver on the track, not suprising better choices exist that are worth more for that purpose.