If you have a 150 ft lb torque wrench go the full 150 then use a breaker bar to get it to the next castellation and that will set you right. Don't apply anything to the taper, clean and dry only.
The fronts are a totally different situation. Tapered roller bearings do not get heavily torqued. I tighten them lightly, then back nut off one castellation and insert cotter pin. You may need to find a good maintainence manual for your car.