Rear end feels like it's floating

I just noticed the rear spring passenger side still is not quite seated it seems just a bit off still after it already Unseating could this be the cause of it just being off maybe a half inch from seated just right on the rubber isolator
 
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Update found a bad upper control arm bushing on passenger rear and reseating the spring correctly fixed a lot of the issue.
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Years ago I had a work van that had that type of floating feeling while driving on the highway. The tires were the issue.
 
Broken shock mount, loose arm mount, tire pressure, alignment, they can all effect how it feels. Could it have very soft shocks that allow it to swallow around?
 
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