Those springs look shot to me, as well.
When the spring loses arch, it gets longer, that is to say, the mounting eyes move apart from eachother, compared to their designed eye to eye distance. The design purpose of the rear hanger absorbs the springs lengthening and shortening during typical on road driving.
Yours are so flat, theyre really long.Or theyre just too long period. Post #16 shows it all. Sorry, they gotta come out.