OK, first things first. Thank you, EVERYONE, for your help and encouragement.
First up on the list - what I learned. I learned that I should follow my instinct and to ignore the temp reading from the food probe (ET-732). I was getting a reading of 165, and my other digital thermometer (Taylor, 9840N) was giving me a reading of 120. Maybe I had the probe too close to the bone, or perhaps just in the wrong spot? Anyway, I learned further that I should pay more attention to the grill temp, and to check the food temp after an hour, or whatever the minimum time is for the recipe, e.g. if the recipe says 1 to1 1/2 hours, check the food temp after an hour, and proceed accordingly. Second, I consider this a success, i.e. the chicken came out juicy, but not as juicy as when I did it on the gas grill. BUT, as my wife pointed out, we used a different recipe for the gas grill. I've got to do the same recipe on the charcoal grill, and then compare.
The rub from this was not good, in my opinion. And, as my wife pointed out (again, she's right more often than I care to admit), the rub really, really, really sucked. And it's what turns her off to rubs in general, e.g. too smoky.
We tasted the rub. We couldn't taste the chicken. We couldn't tell what effect, if any, the use of apple wood had on the recipe.
I used KB to start, and I used lump (Cowboy) to replenish the fire. The replenishment never got up to the cooking temp; but, by that time I didn't care. This is what led me to believe that I should follow my instinct.
The skin was crisp. The flavor was way too smoky. The meat was juicy, with the exception as noted above.
We decided to throw out the rub that we didn't use. We're saving the chicken we didn't eat for sandwiches (chicken salad).
My goal it to recapture what I remember as that charcoal flavor, what I remember (or what I THINK I remember) as that charcoal aroma, from all the cookouts from my earlier years.
I'm not giving up. As Don Quixote sang, "This is my quest, to follow that star, no matter how hopeless, nor matter how far..."
Notice all the holy candles in the background. It wasn't an accident.
I thought it tasted ok, albeit a bit on the smoky side. My wife didn't like it at all.