Roasting color issues

Roasting on the Bullet
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1

Hi everyone, I’m having issues to match light roast in both sides of the beans. When i measured the whole bean im getting 60 agtron level and ground bean 80 agtron level. I thinks There’s a big different so anyone can chare some tips how to avoid it?
Maybe I’m preheating to high? Maybe i need more airflow? Drum speed?
My batches sizes is 350gr 220c ph P0 (soaking for a minute)P6 f2 d9
I’m sharing my last roast.

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Thanks.

2

What bean are you roasting, how was it processed and what level are you roasting to?

3

It would also be good to confirm how you’re measuring the ground sample-- espresso grind, well tamped, for example?