Not only do I think you are right, Herman, but also there's the possibility that the corn has a higher metabolism too. I don't have the Baird's to compare to, but my corns seem to process their meals fairly quickly.
As far as musking and biting goes, I think the keeper is as much the cause as the kept. I picked up one of my Sichuan Mandarins yesterday rather ubruptly and she coiled back and tried to strike at me. Normally the Mandarins are calm and just try to hide. We kind of train them to be docile, I think. Hardly any of my ratsnakes ever musk me. One exception is the Chinese twin-spots, E. bimaculata. They almost always musk when held, but if held very gently, for short periods of time, they sometimes don't mind as much. As much as I try to train them though, they are big muskers.
I think corns and Baird's rats are normally pretty calm, and we try to train them that way to be good pets, but we must remember they are animals that can be unpredictable too.
TC