Sorry it took me a while to watch your inspection, Ter. I was away for most of yesterday, and I just was too tired to do anything last evening after I got home. I was totally enjoying the classic rock! I sang along to "Janie's Got a Gun" as I was watching, that's one of my favorite Aerosmith songs.
That frame you held up to the camera where you were questioning if it was brood or capped honey had brood in the middle and honey in a triangle on the outside edge. In very light wax like that, the key is the opacity of the capping. Honey cappings will be translucent, whereas the brood capping is opaque. This is because the brood cappings have little pores in them so the larvae don't suffocate under the wax. Also just remember that almost all of your nectar/honey is really just syrup, it's not real honey.
Just for my 2 cents on the smoking, I think how much smoke you use is sort of like how much protection you put on, just smoke as much as you need to feel comfortable and to not kill bees. The only critical comment I'd have is to just give them a moment to react to the smoke. If you give them a couple of puffs, and then give them a couple of seconds to calmly walk down between the frames, they won't panic and take to the air to avoid the smoke.
I think adding another box was fine based on how they looked. What did you decide to do about their syrup? Did you remove it or leave it on?