Very little down..inverted
i never did try waterfaling it. he doesnt have the Elevator throw cranked high enough i suspect.. im sure it would the CG is stll back just not far enough back that coupling started.. we tried rolling harriers, blenders, flat spins,harriers, hovers (btw he needed a tad of right thrust too) KE, elevators and a couple of other things i cant think of. but it never crossed my mind to try a waterfall with it..
I just started doing them on a regular basis due to i never had throws cranked far enough and most of the planes i have been flying wont do them.. but i just started flying my YS-63 flip3d and it has at least 60deg of elevator and it will spin like a waterfall sideways like doing a KE spin but FAST!! he he lot of fun

and it will do TEXTBOOK waterfalls too. the extra is WAY overall better plane though
sorry for the book!!