Just from general airframe experience, I would say that the torque loading of a non shoulder bolt onto a moving mechanism, would be unreliable, due to possible differences in the 'Stiffness' of a stiff nut.
Torque loading a stiff nut should take into account the stiff nut rundown torque when calculating the actual torque setting required, ie it should be preordained torque plus rundown torque to give you the actual torque loading that needs to be applied.