"Ah, but if we go faster by lowering the nose a bit we reduce the induced drag don't we, this compensates for the increased parasite drag. Well spotted though."
Something like that.
One other point for grade_3, surely the weight vector is all vertical? If so, do you mean, instead of
"...include resolving the Weight Vector into a vertical and horizontal component."
...resolve the Weight vector into a forward component and a right-angled component. Label the FCW. You can see this by putting your whiteboard pen/chalk on the ruler or (plank of wood) you are using to draw your lines and tilting it. "The FCW is what makes the pen move."