Somethign that came to my mind after reading your answer.
The reason, why the power consumption is lower, is it because there is no CPU verification? 20-40W difference is big, and i doubt it, but does not hurt to ask

ff, but it works. I left only the most relevant data. Replace again IP and PORT with the ones you need.
Ha! That would def be cheating, wouldn't it? No, I can assure you that the lower power draw is from the continuous gpu work. After all, cpu verifications are for found shares only, so depending on your pool diff you maybe crunch one CN hash on the cpu every 10 secs (max)? It's tiny work in the grand scheme of things. Love the question though!
A clarification for the Power Usage though - i observed it, and although lower, it would still spike to ~20W higher than the average. Not sure if you have observed this.