I suspect you may have not hit second crack. Have you done more batches? That first one you posted did not look like it had hit second crack to me.
I asked for the same machine for my birthday. Good chance I get one.
Ya that one I posted is the only one I've done focused on light. Definitely nowhere near second crack on that one. I've done several other roasts where I pushed them much further but just haven't felt like I've found that light bulb "ohhhhh that's definitely second crack" moment.
So far I'm really digging the machine. No doubt in more experienced hands it would really roast some great coffee. Even my first handful of attempts have been damned tasty.







