I re-examined the current batches to find out that I forgot and omit one batch which I had to put the beans on the roaster twice. I did not intend to do this but the fire went off at the early stage of one before last roasting. Out of total eight batches, One is an off-home run and another is neary a running home run and so on. Out of draws and looses, the first two batches and one batch of Kenya which I never really failed to roast properly were not as good as I expected. These again reminded me of the importance of preheating the front panel.
Due to the change of season or weather, may be, the parameters changed more than I predicted ; it was so hard to compensate for the current settings. It also pushed me to preheat the back panel, too.
I worked on this theme and I learned how to install the heater on the back panel last Sunday; getting ready for the final tests on this environment.