If I may be so bold to suggest,,if there is one thing you need to hammer into muti-students its drag! drag! drag!!!
Everything hinges on eliminating the most drag you can. Flaps in the wrong position, gear, the opening of gear doors during the cycle, cowl flaps, too little or too much rudder,, its all killer drag.
Seems we all teach directional control (and that is very important), but after you straighten the old girl out, the thing is not going to stay in the air if you don't get rid of all the drag. Difference from making it and parking it. Seems to be very forgotten.
In my humble opinion.