Look at water skiing. A good slalom skier can slow, and turn a heavy boat. Pro ski boats have a hitch mount on a center pole in the boat instead of the stern, also they have huge rudders and skegs down the center of the boat to resist when the skier pulls over to the side. This is a 200 lb person moving a really heavy boat with a tiny ski in water. Compare this with a 3000 lb towplane pulling a 800 lb glider (with a huge wing) letting an aero tow turn into a winch launch. The glider loads the rope, (2000 lbs) slows, and pitches the towplane down so quickly the tug doesn't have a chance. A glider boxing the wake can pull a towplane all over the place, if he doesn't resist. Towplanes can resist lateral movement by banking the wings. In a kiting situation only the elevator is any good. So, the glider can pitch the towplane down without having an extreme up rope angle. The towplane would need cg hook and a big elevator. The glider pilot must pay attention during tow! If you absolutely have to deal with a problem that takes your attention from the towplane, then release first! Now deal with the canopy or whatever.. Don't fiddle with a cellphone, camera, flight computer, radio, canopy, bug in cockpit, look around, or anything that takes your focus off the tow. Do this before takeoff or before you even move onto the runway. The towplane must be your entire world until 1500 ft at least.