best rear shock for adding 1" of height???

I gained a little over 1/2 inch over the tire (after I drove it around to let it all settle). Happy with the stance! Ride is actually smoother/softer. However, I've got to adjust traction bars now, because for whatever reason when power braking the driver's side raises up a lot faster. Before it raised evenly.
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Is there a provision to add some shims under the springs to raise the rear more if you want it? That would be nice to fine tune ride height.