Mancini extra heavy duty springs sagging

Sorry,I re-read your first post,and you stated the drivers side is low. That is the way the springs are designed. You have them installed the Correct way.

I always believed the left side was supposed to be slightly lower because when the car launches it shifts weight to the right side which you would want to be stiffer (higher) to hook up.....
When I installed the XHD springs on my Scamp the right side is higher when you install the springs correctly.