Andy M.
Certified Pretend Chef
You know what, I have never cooked eggs over low heat. I've always cooked scrambled eggs over as high as heat as possible, stirring constantly, and they ALWAYS, come out light, fluffy/puffy, and moist. There may be a little liquid coming out of them, but I just soak that up with some paper towels. I mix the eggs with a bit of milk or cream, salt, and scramble them in a pan on heat heat with a little butter (not allowed to brown, just to start to sizzle). The eggs I've seen cooked over low heat don't look nearly as appetizing as what I make.
The liquid you have to soak up with some paper towels is the result of the proteins in the eggs getting too hot.