The best thing you can do is put the zimmer ride shocks in the bin. I had an issue where the car started to ground out. The first issue was the springs had dropped, lost their tension? The second I found when I replaced the springs, the dampers had very little compression resistance and lots of rebound resistance. This meant that when you drove a rough road the ride height would drop.
I had these and would recommend you bin them.
My springs failed, lost tension and the car lost ride height.
The worst problem is the dampers they had very little compression resistance and a lot in rebound. You could close easily by hand and needed all your strength to extend. What this meant on the road is the car would botton out driving down a rough road or after hitting a few bumps.
I changed to GAZ dampers all round and it made a huge difference to the handling.