I too believe that adding wood chunks to charcoal cooker (i.e. WSM, Stumps, etc.) is different ballpark not to oversmoke compared to large offset. When using an offset, I burn mostly hickory because of availability and it is common flavor in Alabama. To specifically answer your question, I offer the following things I have observed.
1. We often tend to start cooking too quickly before the fire has settled in with a nice, hot, properly sized bed of coals. Plan for at least an hour, but depends on wood and fire starting method. I sometimes get the smoker really hot to clean it (350*F) and then wait until it settles back down and wood is added again before starting. A few use Oldschoolbbq mod to preburn wood, especially in simple cinder block pit with whole hog.
2. Like Dave Russell said, there is no substitute for proper fire management in offset. Add wood too soon and it is too hot. Add too late and it will smolder until going again. Wood should be properly sized and moisture content for your feed rate (2 sticks per 45-60 minutes is common for me)
3. Wood moisture is not discussed often, but I find that wood can become hard to cook with after several years when it gets really dry. Think paper... it just burns quick and hot and fewer coals. Maybe most folks don't have wood around that long, but I used to cut wood a few times a year to maintain different lots. I keep it under shed and off the ground and split anything over about 5-6 inches. Since I bought my Stumps, I don't manage my wood actively to maintain that perfect moisture content.
4. You need to control the fire by controlling the draft through the intake vent while leaving the exhaust open. This means never overloading the fire with wood. It is convenient to use the exhaust damper to choke the fire (you see results almost immediate), but you are paying with thick smoke from a smothered fire. Cook on a windy, rainy day and don't be surprised to lose control of the smoker draft, temps, and smoke flavor.
My first cook was with my brother and we used week old, fresh-cut hickory. I think you already know how dumb that is. I still laugh about it. I will try to set you up with an experiment soon!