Here's another roast of the same coffee, but darker. The previous, lighter roast is in the background. Here, the air has a flat 8V setting, and as a result, the gas cuts are made a slightly different times.



As mentioned by one of the pro roasters here (apologies, I forget who), the biggest "knob" that you have is roast level. Even another 40s and 5F can make a huge difference to taste. Once you have a decent profile that you can reliably repeat, I'd recommend trying several roasts with varying drop temps. I find it quite amazing how quickly and significantly the taste profile can change with just this single change.