Tanabe Rear Coil Springs - DS Rear Knock

Wanted to see if anyone else had experience this. I purchased some used Tanabe Sustec Coils off of here, they were in great shape by the way and thanks for the help.

My DS rear has a bit of a knock rattle, when going over bumps. Don't here anything in the corners. I have shortened the bumps stop and checked them twice, look like they are seated well.

Any other thoughts/suiggestions/ideas what it could be.

On another note, wish the front sat a little lower, a bit lower in the rear, but overall pretty happy. Onto a roof rack, exhaust & an intake.