Hi at535, I usually start off my roasts with the hg nozzle inside the bucket just above the paddle and to one side of the bucket opposite my temp probe.
I thought about the nozzle attachments but thought that it might concentrate the heat in one area instead of dispersing it evenly.
As the beans heat up I gradually move the hg higher to ease off the heat.
Usually reach first crack around 11-13mins and second 5-6 mins after that.
Enjoy your roasting.................gm