I agree the simple solution to flying a rounder loop is to fly faster and smaller.

However, maneuvers where you're forced to loop back into the wind (ie, Cuban eight) are where you'd expect sombody struggling with power and size to have to open up their loop by either completely releasing the elevator letting the plane fall over the top of the loop or even hold in a bit of down to hold it up a bit (but still maintain an arc) as they try to penetrate upwind. But as soon as that holding it up a bit becomes a clear segment then it's a point off so do it smoothly....