From what I've seen of HF torque wrenches, they suck and are inaccurate. For stems, bars saddles & seatposts, my general rule of thumb for those without a torque wrench is to tighten the bolts until the part no longer moves, not until the bolts no longer move.

Thomson stems now come with bolts having a 3mm hex head for the very purpose of keeping hamfisting to a minimum, as the wrench will bend before you can over-torque the bolts.