Well, I just love this Behmor. Nope, haven't figured it out yet, but that's to be expected. I did two roasts, each weighing 1/4 pound of the same blend (came with the roaster), called Espresso Milano. The first one I set to 1/4#, P3, B, and it looks like breakfast cereal. The second one I set to 1/2# (even though it is really only 1/4), P3, B, and it looks like Charbux. In both cases I resisted the impulse to add or subtract time because I really am trying to understand what the machine can and can't do.
Eventually I will roast something that won't end up in the compost pile....