Does removing those resistors help the plate temp, too?? That's the other problem I've experienced with drip coffee makers. The "keep warm" temp is often too low.
Unfortunately no.....they are two separate elements.....mine keeps the coffee pretty hot after brewing, but I suppose that if you pick the right coffeemaker to start out with this could be modified as well.
Keeping the brewed coffee hotter would be an easier modification than the brewing part, as the "plate temperature" is regulated by a small "klixon" thermostat that is attached to the bottom of the plate (at least in the ones that I've had apart). These small bimetallic cutoff thermostats can be purchased in a variety of different temperature settings, and simply replaced. They are usually small, circular objects, about a half-inch in diameter, and cemented to the bottom of the plate, with two terminals for the supply wiring.
Your coffeemaker manual will likely tell you where the factory setting is in the specifications section, I will guess that they are probably around 120 degrees for safety purposes......replace it with one that is twenty or so degrees higher.
doc