My torsion bars took a 3' Breaker bar to budge. (along with pbBlaster).
They can be misleading, and appear that they are maxed but still have some room to go.
If I was doing it again. I would loosen my T-Bars all the way, and re-index them so I could get a little more lift with a little less crank. (re-index = rotate the bar ~90º)
Good to know .. i have a rather large 3/4 impact so i dont think i will have that much of a problem " heavy diesel mech"