Rear leaf spring/shock options. Improving ride. Less stiff, more compliant.

I just installed some Toytec Boss coil overs set to 1.5" to "level" my 14' DCLB Sport 4x4. These worked perfectly for leveling the truck and the added benefit is an incredible ride and handling characteristics. So much so that I know want to get a similar effect from the rear. I have the factory 4 leaf pack w/ OEM shocks. I don't want any more lift from the rear. I also have Firestone airbags installed.

Options I've considered but have no real clue to whether any of these will accomplish what I'm looking for.

1. Simply replace the factory OEM shocks.

2. Remove "TSB"/4th spring from spring pack and rely on airbags to maintain proper ride height.

3. Replace OEM leaf springs w/ aftermarket type designed for better ride. All the leaf packs I've looked at claim 1.5-2" of lift. Not sure if this "lift" is over 3 leaf pack or 4 leaf/TSB leaf pack. Since TSB gives approx. 1" lift over 3 leaf pack this may be more lift than I want. Especially considering I don't know if the advertised lift is based on the 3 or 4 leaf.

4. Leave it alone as it's still rides pretty good.

 

4