To answer the Australia Low Tow question, as seen in the The Gliding Federation of Australia Inc Aerotowing Manual

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10.1.12.High-tow and Low-tow An aircraft in flight generates a “slipstream” behind it.This is a region of turbulent air, originating mainly from large vortices streaming from the wingtips, with small amounts of mechanical turbulence such as propeller wash thrown in for good measure. A glider pilot may choose to fly either above or below this turbulent slipstream(Refer 10.1.10).Australia tends to favour the “low-tow” position.Other countries prefer “high-tow”.
10.1.12.1.Low-tow With a glider in low-tow, below the slipstream, the combination tends to be less pitch sensitive and tow pilots have less difficulty in maintaining attitude for a constant air speed and a stable platform for the glider pilot to follow.
10.1.12.2.High-tow In high-tow, above the slipstream, the combination feels a little more pitch sensitive and tow pilots need to work harder to maintain a constant climb attitude and air speed.The difference is not large and tow pilots should have no difficulty in maintaining a stable platform whichever position the glider pilot chooses.WARNING: HIGH-TOW IS, BY DEFINITION, ABOVE THE SLIPSTREAM, NOT ABOVE THE TOW PLANE. There is one important difference between low-tow and high-tow and this becomes apparent if a glider gets out of position vertically(i.e. too high). In low-tow a glider can get very low and still not cause significant difficulty for the tow pilot in controlling his aircraft.Furthermore, out-of-trim forces tend to change at a slow enough pace that the tow pilot has ample time to release the glider if there is any fear that the limits of elevator control might be reached. In high-tow, things happen more rapidly and the tow pilot will have less time to react to a glider going too high.If a glider that is out of station in high tow(i.e. too high)is not released immediately, there is a risk of the tow plane being pulled out of control.See Section 10.3“The tow plane upset”. Tow pilots need to be trained to tow gliders in both high and low-tow and to experience a glider transitioning between the two positions.To avoid subjective judgements about high-tow and low-tow, the reference for the glider pilot establishing the towing position is always the slipstream.