Don't have an 'actual' Bundt® Cake Recipe, or mix, but I have a Bundt® pan and want to make a 'Bundt®-style' cake. So, 1) How much 'volume' do you use? I.E. 3/4 full, or 2/3, or what? 2) Does it need more leavening, since there's more 'space' to fill? Have 2 boxes of brownie mix that I'm thinkin' 'bout tryin' to make a Bundt® cake out of it.