Unclamping the rear will make it, the rear half, separate more, not good
Moving the upper hole forward to increase the rear shackle angle will allow the springs to move forward without going past 90 degrees, straight up and down on the shackles, and not pulling the back of the car down as it goes past 90 degrees
Now get to work fixing it
Your car looks a lot like my old pump gas Duster but higher in the rear end. I had ladder bars with coil overs installed on it
That car would hook up in a mud puddle in a rain storm AKA aside, it flat hooked