If you are compensating for unevenness of your leafs by adjusting your TBs, and you are running this on the street - well - that does not sound like a good plan to me ... but it's your nickel.
Why? How do you know the factory didn't do the same thing, how much cross weight is incurred by doing that, what effects that would have on handling, and that the torsions were equally loaded in the first place?