In a nut shell heres my inturpretation of torqe vs holding power. Maybe I am using the wong terminology from what i have come to learn is that torque is used to get the servo to deflect to the point where you want it, and holding power is the servos ability through gear train and composite make up to hoold it at that location until the operator releases the stick. Of course I am not alwas correct and if this is not true then I am all ears.