My take, you have the best of the best struts on the front combined with some of the very worst shocks on the back. Sorry but think the spring combo will never work, yes regardless of what the internet says. Front, MM coil over kit combined with your struts will transform the car in both feel, handling and ride. Rear, do the same on a D/A Koni and C/O kit. Next, MM lower front arms plus rears Ross suggest (which also means you can ditch quad shocks) will take car to a whole other level.
From pic, looks like end link is not tight enough.