Dan,
I didn't really select a preset profile, it's just that P1 is the default. I was just going straight into manual mode and setting an estimated time based on average roast time. Essentially I hit it with full heat until 1c, then moderated same. As for wall thermistor temp, I don't pay much attention until 1c, so it is the second ramp up, particularly at the point of the "rosetta" time.
This got me thinking, so I did a roast tonight and experimented a bit. I used the P3 preset for a gentler drying phase, then at the 3 min mark switched to manual full power and increased drum speed. I used the wall temp to anticipate 1c and went to 75% power at a point that turned out to be 40 seconds before 1c. I maintained that heat setting through the end of the roast. 1c was steady and appeared not to stall. I'm excited about the result. Good even color. No surface oil. Good fragrance. Time will tell, but I have high hopes. This is a small dense bean with a unique roast behavior, but I think when the roast is nailed, the reward is stellar. Best of luck to all. I'll think good thoughts.