Waste of money + headache
You are slowly destroying your under carriage and stock suspension.
No coil-over or aftermarket springs will beat your OEM setup.
So, if you want to go with coil-over, I would suggest that you check or replace all your OEM bushing, chamber kit and ball joints. Then get an alignment done, some auto-shops will not touch cars with aftermarket coil-over.
Now, if you want to go with aftermarket spring, you better get the correct shock & strut that will accommodate you springs.