As far as Artisan goes, you can find all the basics here. This was designed to cover the basics for new users. https://artisan-scope.org/docs/quick-start-guide/
One thing that caught my eye was you said - .
Airflow at max could be fighting with your gas settings.
Hi BuzzBuzz, i am not sure but i think you weren't aware that i was referring to my pre-charge routine. To ensure i am charging the beans to a properly heated drum, before charging i let bean temp rise to a few degrees above my target charge temp. Then i reduce or turn off the gas and maximize airflow. This will start to decrease my bean temp probe reading (remember that the drum is still empty right now). Then a few degrees below my charge temp, i increase the gas again along with reducing the airflow which increases BT again. Once i reach charge temp, i charge the bean.
Okay time for an update. This is my second batch. I charge the beans at much lower temp this time which is 160C. Here's my log on the second batch.
I learned that roasting by keeping IAT constant was difficult with my roaster so i focused on keeping delta BT declining (i reduced smoothing as suggested) except around minute 12 where i panicked as deltaBT was about to reach zero while i was still few degrees behind my target drop temp so i turned the gas up a bit again and end up with flat deltaBT up until i drop the beans (or was it the exothermic phase that caused this?).
For airflow, i was following Mill City's suggestion of low-med-high procedure and played with the gas setting while keeping an eye on deltaBT.
I replaced the ET probe (reminder: it's inside the bean chute just before beans enter the drum) with a different probe and managed to hang the probe without it touching any of the bean chute plate. Unfortunately, i still get low ET. This is very strange as only a few centimeters above my ET probe (closer to the bean hopper) is my analog temp gauge which read normally (above 200C during the whole roast).
I noticed something interesting: i was dropping the beans at around the same temp as my first batch (204C vs 205C) but my beans are slightly darker this time. Can you guess which is my second batch? It's the right one. Is this normal? So, how did i do this time? I think i did better. Any suggestions? Chewing the beans gave promising result but i need wait to until i brew it tomorrow to confirm any improvements.