I have tokico illumnias all around with Eibach springs with about 8k on them... the rears are set to 5 stiffness

If i go over a good rounded bump (not peaked) in the road.. the front will take it normal.. but the rear will bounce up and down as if the shocks aren't controlling it as fast as the fronts are..

I have a decently heavy system in the back.. as you can tell in my sig..

It reminds me of when i had my stock suspension... and it was COMPLETELY blown in the rear.. but it was also about 15x worse..

Speed bumps.. the rear just hops over speed bumps.. It doesn't bounce... only on wavy roads it will bounce.. is that normal?? I'm going to take out my sub and see what happens

 

You can try to lower the stiffness on the rear to 1 and see if it changes the way it rides. If it doesn't, then chances are the shocks are blown.

Tokico shocks are known to be good so I wouldn't think they would be blown.

 

i switched it to 1.. and it felt alot softer.. didn't really bounce on the street i tested it on... (where it always bounces at)

So i set it to 4 in the back.. feels more comfortable and the car is alot more predictable.. its probably because i have a LTB in the front without a RSB evening out the back.. lol

 

Try twisting it from 5 to 1 and back again a few times. Should become still again.