Ok, maybe the spring seats are fine since you can't remove them.

Bring the spring farther down. Try spinning the top adjustment ring all the way down to where the bottom ring is. Don't worry about slack or excessive play.

The ride is going to suck no matter what. Ebay coilovers + stock shocks = absolute worst of the worst for ride quality. If we would have known from the beginning that you planned on this setup, we would have discouraged you from making this mistake long before you even started the install.