H2 lift

Im thinking about lifting my H2 with a Cognito lift. Its a 10" lift then add torsion keys to make it a 12". My question is, after using the torsion keys can I crank the torsion bars to get another inch out of the suspension? I haven't worked on truck with torsion bars so I dont know if installing torsion keys is the same thing as cranking the torsion bars. Any help would be appreciated.