I was able to get well into 2nd crack with mine on Friday, roasting 1lb. Maybe mines "super powered" but I haven't had any issues with dark roasts. With that said, it fill my house with smoke when roasted that dark, which is pretty irritating.
That's why I think something has changed since the early models. Or maybe I had a dud. Or maybe you got lucky. I'm guessing the max on P1 is still 20:30, correct? So your unit is simply pumping in more heat than mine. I've NEVER been able to get to 2nd crack with 1lb, even brand new. I stick to the 12oz size because of this. And I've checked my voltage and it's good.
I found power requirements make a big difference. Roasting on the kitchen counter I have no problem reaching 2nd crack. Using the receptacle on the back porch I almost don't make 1st. Shutting off the A/C and/or dryer makes a noticeable difference.
Yup. The Killawatt is a handle tool for roasting with the Behmor.