Well I froze my hands this week so I got to thinking that since we ride mostly in the daylight I'm going to just unplug the low beam leads from the headlights and free up 110 watts that the heaters can use. I'll just turn on my high beams with the high low switch when I need lights. I might have cold hands at night but its a start.
M5
I don't know that doing this will actually help. I believe there's a "program" that is looking for certain parameters (probably mostly RPM) and not monitoring the actual draw in the system.
I say so because I have my headlights totally unplugged and without the yamaheater, the grips are still cold...