I took my original leaf springs to a spring shop and had them Re-arched and they are the perfect ride heigth even after 2 1/2 years.
i wish i had that choice,,theres none around here,,i think i will use chryco's suggestion and get another pair of springs and use the top leaf cut to fit and use the shackles to get it where i want it,, with seasoned springs it should stay the same after installation..a little air in the shocks for insurance if nessacary..