Hi, I have one of these cake molds but i am not sure how much to fill the base when you use the insert. I have filled it just so that the insert is resting on the mixture in the base and am baking it as i speak but the timing is not what they suggested for my mixture to cook through. I used 120zs of flour, fat, sugar and 6 eggs. The top half looks done but i haven't turned it out yet but the bottom half I am concerned for...any help out there please|?