If you just put new coil springs in you need to drive it for at least 500 miles so the springs can seat themselves. Coils will loose some of their initial height over the first few hundred miles and your truck will sit a little lower after that happens. Also a difference of 1/8" from side to side can't be seen by just looking at it. I don't think you'll ever find coil springs that will sit any closer than that. Another option, after the springs seat, would be to cut a portion of one coil (cut it with a saw not a torch) if it still sits a touch too high. You could also go back to the smaller tires that were on it when you bought it.
Coilovers are fine but I think you would be wasting your money.
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