I suggest it you may have needed a more aggressive profile, getting into FC a little earlier and really just letting it coast from FC to get the right development time for what you're chasing in terms of flavour. Your time getting into FC may have been a little slow, but the Rate of rise seems to be a little up and down. As mentioned, the Rao style of roasting is based on that declining RoR, which can be achieved by a higher charge and and gas to start, then slowly ramping gas down and or airflow up as the roast progresses to get the desired RoR curve.
The damper adjuster will give some airflow adjustment and without knowing the machine specifically, it would likely have a decent effect on its roasting performance. All of my roasting on drum roaster has involved variable airflow fans, so I don't have too much information on the use of dampers sorry.
The damper adjuster will give some airflow adjustment and without knowing the machine specifically, it would likely have a decent effect on its roasting performance. All of my roasting on drum roaster has involved variable airflow fans, so I don't have too much information on the use of dampers sorry.

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