First roast - grassy taste (chaff??)

[SusanJoM]

I still haven't seen the profile (need a .png file), but to second and third and fourth the comment on the grassy taste, just consider the smell that signals End of Dry.  That is what is being locked into the bean instead of forced out if  you go through that phase too fast.  It's as if you have sealed in rather than set it up to roast off....

[canadaroaster]

Hey Susan, please see attached my last attempt last week. I dropped at 220C, at around 120C I turned the heat up but noticed BT was rising fast so I turned the heat down let it stay for around 6.5 min after BT surpassed 200C it started first crack i let it stay for a min then I poured the beans out.

The beans are fine better than my previous attempts, grassy taste is faint and there is more good acidic flavor. See image attached.

Any thoughts?

[SusanJoM]

Thank you for uploading the .png file, and thank you for your confidence in me, but I don't 'do' profile analysis.  I leave that to other members of the forum. 

The picture looks like the beans are underdone, and only 1 minute post 1C sounds underdone, but beyond that....I will leave you to the others.

[kctremel]

it looks like between the 4-6 mins it kind of flattened out delta BT. Maybe don't lower heat as much during that period and keep everything else the same. try little longer after first crack ends too, maybe 2 mins? always check your trier to look at the beans and decide from there.