Tractor Vet made a **GREAT** point, and I'm sure most of you missed it. Get your torque wrench calibrated!!!
Also, be sure you use the wrench properly, or you're fooling yourself. If the bolt/nut is not turning, you're not measuring torque. Loosen the bolt and then use the torque wrench to snug the nut/bolt to the proper value. If you stop, you might have to loosen again a bit, befor torqing again.