Hi Ray Kane,
I have removed the over load leaf from the rear springs on my 2K Tundra. It made quite a difference in the ride. It also lowered the rear of my truck the thickness of the leaf, about a half inch. The now softer rear suspension also let it settle just a little. I also have the lowering shackles.
I would also recommend the helwig rear sway bar for much added stability in the corners as well as in wind conditions. The sway bar has no effect on the straight line ride. I believe you said you bought the BF Goodrich Long Trails. You might consider the Michelin SUV the next time you need a tire. It is a very well made quiet tire and usually needs very little weight to balance the tire.
Good luck to you on your mission.
Azul