I roasted 150g of Yirg. Just after 1st crack the IMEX started to stall. Like previous times, I moved the roaster closer to the wall so that less hot air could flow out. This got the temperature going up again, and I managed to stretch my roast to over 11 minutes. The roast was very dark, I think I may have gone more than a minute into rolling 2nd. I am not sure, because I couldn't hear it, but the smell was an indicator.
Anyway, the resulting beans are so fragrant! Just like Phil's roast. I have to experiment more with temperature.
The manual says that you can stretch a roast by using fewer beans. So I may give that a try next week.
To be continued...